. The biology of the frog. Frogs. THE BIOLOGY OF THE FROG of the oviducts are thick and glandular except toward the posterior end, where they become expanded into thin, very distensible sacs, the uteri, in which the eggs collect before being laid. The uteri open separately into the dorsal side of the cloaca. The gonads of the male, or testes, are very different in size and appearance from the ovaries. Each testis is an ovoid, whitish organ, occupying a similar position to the. Fig. 21.—Rana temporaries. Dissection from the left side; the viscera somewhat displaced, an, anus ; b. d, bile duct;
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. The biology of the frog. Frogs. THE BIOLOGY OF THE FROG of the oviducts are thick and glandular except toward the posterior end, where they become expanded into thin, very distensible sacs, the uteri, in which the eggs collect before being laid. The uteri open separately into the dorsal side of the cloaca. The gonads of the male, or testes, are very different in size and appearance from the ovaries. Each testis is an ovoid, whitish organ, occupying a similar position to the. Fig. 21.—Rana temporaries. Dissection from the left side; the viscera somewhat displaced, an, anus ; b. d, bile duct; b. hy, body of hyoid ; bl, urinary bladder ; bl', its opening into cloaca ; c. art, conus arteri- osus ; cblm, cerebellum ; cl, cloaca ; cn. 3, centrum of third vertebra; cp. ad, corpus adiposum; crb. h, cerebral hemisphere ; d. ly. s, dorsal lymph sinus; du, duodenum; ep. cor, epicoracoid; eus. t, Eusta- chian tube; FR. PA, fronto-parietal; gl, glottis; gul, gullet; il, ilium ; is, ischium ; kd, kidney; I. au, left auricle ; I. Ing, left lung; Ir, liver; m. mck, mentomeckelian ; n. a. 1, neural arch of first ver- tebra ; olf. I, olfactory lobe; opt. I, optic lobe; o. ST, omo- and epi- sternum ; ped, pericardium ; PMX, premaxilla ; pn, pancreas; p. na, posterior naris ; pu, pubis ; ret, rectum ; r. Ing, right lung ; s. int, small intestine ; sp. cd, spinal cord; sph. eth, sphenethmoid; spl, spleen ; st, stomach ; s. v, sinus venosus; tng, tongue ; ts, testis; ur, ureter; ur', its aperture into the cloaca; tjst, urostyle; v, ventricle; v. ly. s, ventral lymph sinus ; vo. t, vomerine teeth ; vs. sent* vesicula seminalis.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Holmes, Samuel J. (Samuel Jackson), 1868-. New York : The Macmillan company