272 



ZOOLOGY 



SECT. 



puLcuJtr 



is very different from what we have met with in Fishes, the differences 

 being due partly to the absence of a tail, partly to a peculiar modifica- 

 tion of the lateral veins, 

 and partly to the replace- 

 ment of the cardinals by 

 cctr.al a postcaval vein, found 



among Fishes only in the 

 Dipnoi. 



The blood from the 

 front part of the hind-leg 

 is brought back by a 

 femoral vein (fm.), which, 

 on reaching the ccelome, 

 divides into two branches, 

 a dorsal and a ventral. 

 The dorsal branch is the 

 renal portal vein (rn.pt.) : 

 it receives the sciatic vein 

 (sc.) from the back of the 

 leg and passes to the 

 kidney, in which it breaks 

 up into capillaries. The 

 ventral branch is the 

 pelvic vein (pv.) : it unites 

 with its fellow of the 

 opposite side to form the 

 abdominal vein (abd.) 

 which passes forwards in 

 the ventral body-wall, 

 between the linea alba 

 and the peritoneum, to 

 the level of the sternum, 

 where it turns inwards 

 and divides into two 

 branches, both breaking 

 up into capillaries in the 

 liver. Just as it enters 

 the liver it is joined by 

 the hepatic portal vein 

 (hp. pt.), bringing the 

 blood from the stomach, 

 intestine, spleen, and 



FIG. 943. Rana texnporaria. The arterial system, 

 with the heart, lungs, kidneys, and left testis, from 

 the ventral aspect, car. carotid artery ; car. gl. carotid 

 labyrinth ; c. art conus arteriosus ; car. tr. carotid 

 trunk ; coel. mes. coeliaco-mesenteric artery ; CM. 

 cutaneous artery ; d. ao. dorsal aorta ; du. duodenal 

 artery ; gs. gastric artery ; hp. hepatic artery ; il. iliac 

 artery ; int. intestinal arteries ; kd. kidney ; 1. au. left 

 auricle ; Ig. lingual artery ; Ing. lung ; ces. O3sophageal 

 artery ; pul. pulmonary artery ; pul. cu. tr. pulmo- 

 cutaneous trunk ; r. au. right auricle ; rn. renal arteries ; 

 scl. subclavian artery ; spl. splenic artery ; syst. tr. 

 systemic trunk ; spm. spermatic artery ; ts. testis ; v. 

 ventricle ; vert, vertebral artery. ,, , , , 



pancreas. Ine abdominal 



vein also receives vesical veins (ves.) from the urinary bladder, and 

 a small cardiac vein from the heart (cd.). It represents the lateral 

 veins of Elasmobranchs united in the middle ventral line : the 

 pelvic veins are their posterior free portions. 



