"The Red-Throated Dragon shows a large membranous expansion (b b) situated between the anterior (d d) and posterior extremities, and supported by the ribs. The dragon by this arrangement can take extensive leaps with perfect safety."—pettigrew, 1874

Red-Throated Dragon

"The Red-Throated Dragon shows a large membranous expansion (b b) situated between the anterior (d d)…

"Next in order is the aqueous humor, b, e, in the middle of which is the iris, d, c. Behind the pupil we have the crystalline lens, f, and then the vitreous humor, h, filling all the interior of the ball of the eye. m indicates the retina, which is an expansion of the optic nerve, n. k is the choroid coat, a membrane interposed between the retina and the sclerotic coat; it terminates in form in a series of folds or filaments, g, called the ciliary ligament or process." —Wells, 1857

Eye

"Next in order is the aqueous humor, b, e, in the middle of which is the iris, d, c. Behind the pupil…

"a, sclerotic membrane; b, cornea; d, retina; o, optic nerve; v, vitreous humor." -Comstock 1850

Eye

"a, sclerotic membrane; b, cornea; d, retina; o, optic nerve; v, vitreous humor." -Comstock 1850

<em>A</em> and <em>C</em>, lachrymal canals; <em>B</em>, lachrymal sac; <em>D</em>, small muscle which serves to compress the lachrymal sac; <em>F</em>, glands upon the inner surface of the eyelids, with ducts opening upon the free margins of the eyelids; <em>H</em>, great openings, or antrum, of the upper jawbone. The oil glands of the nose are plainly shown." &mdash; Blaisedell, 1904

Eyelids and lachrymal apparatus

A and C, lachrymal canals; B, lachrymal sac; D, small muscle which…

"Characteristic groups of Micrococci. Zoogloea stage of a Micrococcus, forming a close membrane on infusion." &mdash; The Encyclopedia Britannica, 1910

Micrococci

"Characteristic groups of Micrococci. Zoogloea stage of a Micrococcus, forming a close membrane on infusion."…

"a, axis cylinder; b, inner border of white substance; c, c, outer border of same; d, d, tubular membrane; B, tubular fibres; e, in natural state; f, under pressure; g, varicose fibres." &mdash; Richardson, 1906

Nerves

"a, axis cylinder; b, inner border of white substance; c, c, outer border of same; d, d, tubular membrane;…

"Skeleton and volar Membranes of the Noctule Bat. c, clavicle; h, humerus; r, radius; u, ulna; d1, first digit or pollex; d2, d3, d4, d5, other digits of the manus supporting um, the wing-membrane; m, m, metacarpal bones; ph1, first phalanx; ph2, second phalanx; ph3, third phalanx; am, antebrachial membrane; f, femur; t, tibia; fb, fibula (rudimentary); c, calcaneum or calcar supporting im, the interfemoral membrane; pcl, post-calcaneal lobe." &mdash;The Encyclopedia Britannica, 1903

Noctule Bat

"Skeleton and volar Membranes of the Noctule Bat. c, clavicle; h, humerus; r, radius; u, ulna; d1, first…

"<em>A, B,</em> glands seen in vertical section with their orifices at <em>C</em> opening upon the membrane between the villi; <em>D</em>, villus." &mdash; Blaisedell, 1904

Glands and villi of the small intestine

"A, B, glands seen in vertical section with their orifices at C opening upon the membrane…

"Snail is the common name of gasteropodous mollusks. They feed chiefly on vegetable substances, though they are very indiscriminate in their appetite and even devour the dead of their own kind. The mischief which they do to garden crops is well known. Snails delight in warm, moist weather; in dry weather, their chief time of activity is during the night, and they hide themselves by day; but after rain they come forth at any hour in quest of food. At the approach of winter or in very dry weather they close the mouth of the shell with a membrane (epiphragm), formed by the drying of the mucous substance which they secrete, and become inactive and torpid."&mdash;(Charles Leonard-Stuart, 1911)

Snail

"Snail is the common name of gasteropodous mollusks. They feed chiefly on vegetable substances, though…

"A tiny block out of the stomach wall. a, the mucous membrane; c and d, the muscles; h, gastric glands; m and n, blood tubes to the glands; e, mouths of glands within the stomach." &mdash;Davison, 1910

Cross section of stomach wall

"A tiny block out of the stomach wall. a, the mucous membrane; c and d, the muscles; h, gastric glands;…