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tiG. 21. — The venous system of the frog, with the heart, lungs, Hver, kidneys and 

 right testis, supposed to be removed from the bodj' and \'iewed from the dorsal 

 aspect. 

 ahd. abdominal \'cln ; hr. subclavian vein ; cd. cardiac vein ; ds. b)tb. dorso lumbar 

 vein ; du. duodenal vein ; ext.ju. external jugular \'ein \fin. femoral vein ; ^s. 

 gastric vein ; ///. hepatic vein ; kp.pt. hepatic portal vein ; int. intestinal veins ; 

 int.ju. internal jugular vein ; kd. kidney ; /. av. left auricle ; htg. iung ; Ivt. 

 liver ; vis. cu. musculo-cutaneous vein ; pr. ct. precaval vein ; J>t. ci\ postcaval 

 vein; ptil. pulmonary vein; p7'. pelvic vein ; r.av. right auricle; r7i. renal 

 veins ; ?-«. pt. renal portal vein ; sc. sciatic \-ein ; sf>L splenic vein ; spin. 

 spermatic vein ; s. v. sinus \'enosus ; ts. testis ; I'cs. \'esica! \eins (from bladder). 

 (From Parker and Haswetl's Zoology.) 



G 2 



