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Transverse section of compact tissue of humerus, magnified about 150 diameters. Three of the Haversian canals are seen, with their concentric rings faintly indicated; also the lacunae, with the canaliculi extending from them across the direction of the encircling lamellae, or concentric rings.

Bone Tissue of Humerus

Transverse section of compact tissue of humerus, magnified about 150 diameters. Three of the Haversian…

A small piece of bone, ground very thin and highly magnified. "If a bit of bone is still more magnified we find that very small cavities called lacunae lie between the lamelae; from each lacuna radiate many extremely fine tubes, the canaliculi, so that it looks like a small animal with a great many legs. The innermost canaliculi open into the Haversian canal of the system to which they belong, and those of various lacunae communicate with one another, so that a set of passages is provided through which liquid which transudes from the blood vessel in the Haversian canal can ooze through the bone." —Newell, 1900.

Section of Bone

A small piece of bone, ground very thin and highly magnified. "If a bit of bone is still more magnified…

"Vertical and Longitudinal section through skull of Castor Fiber, showing the cerebral cavity, the greatly-developed turbinal lamellae, the mode of implantation of the large over-growing chisel-edged incisor, and the curved rootless molars." —The Encyclopedia Britannica, 1903

Castor Fiber

"Vertical and Longitudinal section through skull of Castor Fiber, showing the cerebral cavity, the greatly-developed…

"Gill of Fish. A, first branchial arch of left side of black-bass: 1, gill-rakers; 2, branchial lamellae. C, same, in cross-section: 7, branchial lamellae; 8, a gill-raker. B, same arch of striped-bass, with appendages removed: 3, 4, 5, and 6, pharyngobranchial, epibranchial, ceratobranchial, and hypobranchial segments." -Whitney, 1911

Parts of Fish Gills

"Gill of Fish. A, first branchial arch of left side of black-bass: 1, gill-rakers; 2, branchial lamellae.…

"Respiratory system of hag, from ventral surface. b., Barbules; m., mouth opening on ventral surface; g., gullet; g.p'., first gill-pouch, cut open to show internal lamellae; g.p.6, sixth gill-pouch; v., ventricle of heart; ao., aorta; a., common exhalant aperture." -Thomson, 1916

Hagfish Respiratory System

"Respiratory system of hag, from ventral surface. b., Barbules; m., mouth opening on ventral surface;…

"Diagram to show the way in which an outgrowing gill-process bearing blood-holding lamellae, may give rise, if the sternal body wall sings inwards, to a lung-chamber with air-holding lamellae. I is the embryonic condition. L is the condition of outgrowth with gl, gill lamellae. A is the condition of insinging of the sternal surface and consequent enclosure of the lamelligerous surface of the appendage in a chamber with narrow orifice—the pulmonary air-holding chamber. pl, Pulmonary lamellae. bs, Blood sinus." — The Encyclopedia Britannica, 1910

Lamellae

"Diagram to show the way in which an outgrowing gill-process bearing blood-holding lamellae, may give…

Lamellae torn off from a decalcified human parietal bone at some depth from the surface. Labels: a, lamellae, showing reticular fibers; b, darker part, where several lamellae are superposed; perforating fibers. Apertures through which perforating fibers has passed, are seen especially in the lower part of the figure.

Lamellae

Lamellae torn off from a decalcified human parietal bone at some depth from the surface. Labels: a,…

Shown is a thin layer peeled off from a soft bone, which is intended to represent the reticular structure of a lamella.

Reticular Structure of a Lamellae

Shown is a thin layer peeled off from a soft bone, which is intended to represent the reticular structure…

"The remaining three pairs of mesosomatic appendages of Scorpio and Limulus. l130 indicates that there are 130 lamellae in the scorpion's lung-book, whilst l150 indicates that 150 similar lamellae are counted in the gill of Limulus." — The Encyclopedia Britannica, 1910

Limulus

"The remaining three pairs of mesosomatic appendages of Scorpio and Limulus. l130 indicates that there…

"Embryo of scorpion, ventral view showing somites and appendages. sgc, Frontal groove. sa, Rudiment of lateral eyes. obl, Camerostome (upper lip). so, Sense-organ of Patten. PrGabp1, Rudiment of the appendage of the praegenital somite which disappears. abp2, Rudiment of the right half of the genital operculum. abp3, Rudiment of the right half of the genital operculum. abp4 to abp7, Rudiments of the four appendages which carry the pulmonary lamellae. I to VI, Rudiments of the six limbs of the prosoma. VIIPrG, The evanescent praegenital somite. VIII, The first mesosomatic somite or genital somite. IX, The second mesosomatic somite or pectiniferous somite. X to XIII, The four pulmoniferous somites. XIV, The first metasomatic somite." — The Encyclopedia Britannica, 1910

Scorpio Embryo

"Embryo of scorpion, ventral view showing somites and appendages. sgc, Frontal groove. sa, Rudiment…

The Split Gill mushroom (Schizophyllum commune): "a, Schizophyllum alneum; b, gills, or lamellae, enlarged; c, cross-section of pileus showing split and revolute lamellae." -Whitney, 1911

Split Gill

The Split Gill mushroom (Schizophyllum commune): "a, Schizophyllum alneum; b, gills, or lamellae, enlarged;…