"An order of the class Infusoria, the adult members of which have no cilia and no proper mouth, and are non-locomotive." -Whitney, 1902

Acinetæ

"An order of the class Infusoria, the adult members of which have no cilia and no proper mouth, and…

"Fig. 21. -A single barbule, baring barbicels and hooklets; magnified; after Nitzsch. ...barbicels (another dimin. of barba), also called cilia, or lashes (fig. 21); and hamuli, or hooklets (Lat. hamulus, a little hook; fig 21). These are simply a sort of fringe to the barbules, just as if the lower edge of the barbules were frayed out, and only differ from each other in that barbicels are plain hair like processes, while hamuli are hooked at the end; they are not found on all feathers, nor on all parts of some feathers." Elliot Coues, 1884

Single Barbule

"Fig. 21. -A single barbule, baring barbicels and hooklets; magnified; after Nitzsch. ...barbicels (another…

Transverse section of a bronchus. Labels: e, Epithelium (ciliated); immediately beneath it is the mucous membrane or internal fibrous layer, of varying thickness; m, muscular layer; s, m, submucous tissue; f, fibrous tissue; c, cartilage enclosed within the layers of fibrous tissue; g, mucous gland.

Section of the Bronchus

Transverse section of a bronchus. Labels: e, Epithelium (ciliated); immediately beneath it is the mucous…

Ciliated cells, such as those lining the windpipe.

Ciliated Cells

Ciliated cells, such as those lining the windpipe.

"Life history of a coral, Monoxenia darwinii. A, B, Ovum. C, Division into two. D, four-cell stage. E, Blastula. F, Free-swimming blastula with cilia. G, Section of blastula. H, Beginning of invagination. I, Section of completed gastrula, showing ectoderm, and archenteron. K, Free-swimming ciliiated gastrula." -Thomson, 1916

Coral Stages

"Life history of a coral, Monoxenia darwinii. A, B, Ovum. C, Division into two. D, four-cell stage.…

Ciliated epithelium from the human trachea, highly magnified. Labels: a, large ciliated cell; d, cell, with two nuclei."In ciliated epithelium the cells, which are generally columnar in shape, bear at their free extremities little hair-like processes which are agitated incessantly with a lashing or vibrating motion. These minute and delicate processes are named cilia, and may be regarded as active prolongations of the cell-protoplasm." —Kimber, 1907

Ciliated Epithelium Cells

Ciliated epithelium from the human trachea, highly magnified. Labels: a, large ciliated cell; d, cell,…

Ciliary epithelium of the human trachea. Labels: a, layer of longitudinally arranged elastic fibers; b, basement membrane; c, deepest cells, circular in form; d, intermediate elongated cells; e, outermost layer of cells fully developed and bearing cilia.

Ciliary Epithelium

Ciliary epithelium of the human trachea. Labels: a, layer of longitudinally arranged elastic fibers;…

"Diagram of flame cell, the internal terminus of the excretory tubules. c, cilia lining tubule; f, special cilia constituting the flame; n, nucleus of flame cell; p, cell processes; v, vacuole or cavity in cell communicating with the capillary tubules (t)." -Galloway, 1915

Flame Cell

"Diagram of flame cell, the internal terminus of the excretory tubules. c, cilia lining tubule; f, special…

Paramecium are one-celled organisms in the Protista kingdom. They are slipper-shaped, nearly transparent and move by way of cilia. nucleus (n); vesicles (v);

Paramecium

Paramecium are one-celled organisms in the Protista kingdom. They are slipper-shaped, nearly transparent…

Paramecium are one-celled organisms in the Protista kingdom. They are slipper-shaped, nearly transparent and move by way of cilia. nucleus (n); vesicles (v);

Paramecium

Paramecium are one-celled organisms in the Protista kingdom. They are slipper-shaped, nearly transparent…

Paramecium are one-celled organisms in the Protista kingdom. They are slipper-shaped, nearly transparent and move by way of cilia.

Paramecium

Paramecium are one-celled organisms in the Protista kingdom. They are slipper-shaped, nearly transparent…

"Paramoecium. ad. Adult form, showing cilia, "mouth," contractile vacuoles, etc. div. Transverse division. con. Conjugation." -Thomson, 1916

Paramecium

"Paramoecium. ad. Adult form, showing cilia, "mouth," contractile vacuoles, etc. div. Transverse division.…

"Paramoecium caudatum. A, the living animal from the ventral aspect; B, the same in optical section: the arrow shows the course taken by food-particles; C, a specimen which has discharged its trichocysts; D, diagram of binary fission; buc. gr, buccal groove; cort, cortex; cu, cuticle; c. vac, vontractile vacuole; f. vac food vacuole; gul, gullet; med, medulla; nu, meganucleus; pa. nu, micronucleus; trch, trichocysts." -Parker, 1900

Paramoecium Caudatum

"Paramoecium caudatum. A, the living animal from the ventral aspect; B, the same in optical section:…

"A., a minute portion of the branched excretory system of a Plathelminth, showing longitudinal duct (I), with cilia (C.), its branches (II and III), and the terminal flame-cells (IV)." -Thomson, 1916

Plathelminth

"A., a minute portion of the branched excretory system of a Plathelminth, showing longitudinal duct…

"B., one of the characteristic hollow flame-cells, leading into the excretory tubule (1), showing the long cili (2), the excretory globules (3), the nucleus (4), and pseudopodia-like processes (5) passing among adjacent cells." -Thomson, 1916

Plathelminth

"B., one of the characteristic hollow flame-cells, leading into the excretory tubule (1), showing the…

A rotifer or wheel animalcule (Floscularia ornata) is a microscopic animal named for the cilia used in motion.

Rotifer

A rotifer or wheel animalcule (Floscularia ornata) is a microscopic animal named for the cilia used…

In this Turbellarian the digestive tract (d.t.) is a blind sac. st., boundary of stomodaeum and mesenteron; c, cilia; g, ganglion (brain); g', ganglion of a new individual which is being formed by fission; o, mouth; o', mouth of new individual in process of formation; w, excretory system.

Stenostoma

In this Turbellarian the digestive tract (d.t.) is a blind sac. st., boundary of stomodaeum and mesenteron;…

Vorticella are members of the Protista kingdom. They are often found in stagnant pools, attached to the stems of aquatic plants.

Vorticella

Vorticella are members of the Protista kingdom. They are often found in stagnant pools, attached to…

Vorticella are members of the Protista kingdom. They are often found in stagnant pools, attached to the stems of aquatic plants.

Vorticella

Vorticella are members of the Protista kingdom. They are often found in stagnant pools, attached to…

Vorticella are members of the Protista kingdom. They are often found in stagnant pools, attached to the stems of aquatic plants.

Vorticella

Vorticella are members of the Protista kingdom. They are often found in stagnant pools, attached to…