262 



ZOOLOGY 



SECT. 



the renal veins to the post-caval, part loy the pelvic and abdominal 

 veins to the liver, and thence by the hepatic veins to the post-caval. 

 Lastly, the blood which has been purified in the lungs is returned 

 by the pulmonary veins (pul.) directly to the left auricle. 



. fvSO. Rana temporaria. The venous system with the heart, lungs, liver, kidneys, and 

 right testis, from the dorsal aspect, aid. abdominal vein ; <>r. brachial vein ; cd. cardiac- 

 vein ; at. liii/i. clorso-lumbar vein; <lu. duodenal vein; erf. jv. external jugular vein ; fm. 

 femoral vein ; ys. gastric vein ; /</>. hepatic vein ; Itp. j>t. hepatic portal vein ; int. intestinal 

 veins; int. in. internal jugular vein; kd. kidnoy ; /. uv. left auricle; ing. lung; Ivr. liver; 

 /w. cu. musculo-cutaneous vein ; pr. cr. precaval vein ; pt. cv. post-caval vein ; put. pulmonary 

 vein; pv. pelvic vein; 7-. UK. right auricle; r;?. renal veins: rn. pt. renal portal vein; 

 '.-. sciatic vein; spt. splenic vein; spm. spermatic vein; s. r. sinus venosus ; tx. testis; 

 re*, vesical veins. 



It will be seen that there is no trace of cardinal veins in the 

 Frog : these are, however, present in the larva, but, during meta- 

 morphosis, their posterior ends become united with the post-caval, 

 and their anterior ends disappear altogether. 



