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- 



ufi /T'VMr^^ 



M.MCK 



Fig. II. — Ratta temporaria. Dissection from the left side; the viscera 

 somewhat displaced. «;/, anus; b. d,\A\& duct; /'. //v, body of hyoid ; 

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

 c^/w, cerebellum ; cl, cloaca; «/. j, centrum of third vertebra; cp. ad, 

 corpus adiposum ; f/'^. /^, cerebral hemispliere; a'. /v. J, dorsal lymph 

 sinus; dti, duodenum; ep. cor, epicoracoid ; eiis. t, Eustachian tube; 

 FR. PA, fronto-jjarietal ; ^/, glottis; gul, gullet; IL, ilium ; IS, ischium ; 

 kd, kidney; /. au, left auricle; /. lug, left lung; Ir, liver; M. MCK, mento- 

 meckelian ; 7t. a. i, neur.d arch of first vertebra; olf. 1, olfactory lobe; 

 opt. /, optic lobe ; O. ST, omo- and epi-sternum ; pcd, pericardium ; PMX, 

 premaxilla; /«, pancreas; /. wa, posterior naris ; /«, pubis; ret, rec- 

 tum; ?-. Z//^, right lung ; j-. /;;/, small intestine ; j/. f(/, spinal cord ; SPH. 

 ETH, sphenethmoid ; jy»/, snleen ; j-/, stomach ; j. z', sinus venosus; tng, 

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

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

 teeth; vs. sem, 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 



