76 



THE BIOLOGY OF THE FROG 



CHAP. 



are greatly enlarged, and may be recognized by the small, 

 globular, dark-colored eggs which form the greater part of 

 their mass. External to the ovaries are the large, white con- 



d/.i y 



SPH.E T H 



opt I gl 





FIG. ii. — Rana temporaria. Dissection from the left side; the viscera 

 somewhat displaced, an, anus; b. d, bile duct; b. hy, body of hyoid ; 

 bl, urinary bladder; bV , its opening into cloaca; c. art, conus arteriosus; 

 cbhn, cerebellum ; el, cloaca; en. j, centrum of third vertebra; cp. ad, 

 corpus adiposum ; crb. h, cerebral hemisphere; d. ly. s, dorsal lymph 

 sinus; du, duodenum; cp. cor, epicoracoid ; ens. t, Eustachian tube; 

 FR. PA, fronto-parietal ; gl, glottis; gul, gullet; IL, ilium ; IS, ischium ; 

 kd, kidney; /. an, left auricle; /. big, left lung; //-, liver; M. MCK, mento- 

 meckelian ; n. a. i, neural arch of first vertebra; olf. I, olfactory lobe; 

 opt. I, optic lobe ; O. ST, omo- and epi-sternum ; ped, pericardium ; PMX, 

 premaxilla; pn, pancreas ; p. na, posterior naris ; ///.pubis; ret, rec- 

 tum ; /-. Ing, right lung; s. int, small intestine; sp. cd, spinal cord; SPH. 

 ETH, sphenethmoid ; spl, spleen ; si, stomach ; s. v, sinus venosus; Ing, 

 tongue; ts, testis; ur, ureter; nr' , its aperture into the cloaca; UST, 

 urostyle ; v, ventricle ; v. ly. s, ventral lymph sinus ; vo. t, vomerine 

 teeth ; vs. sent, vesicula seminalis. 



voluted tubes, the oviducts. These are also suspended to the 

 dorsal body wall by thin sheets of membrane ; they have no 

 connection with the ovaries ; anteriorly they open into the 



