URINARY ORGANS. 



305 



The kidneys of U rode la and Anura lie in the usual position 

 on the dorsal side of the body-cavity ; in the former they are band- 

 like and more extended longitudinally than in the latter, in which 



FIG. 239. THE ENTIRE VISCERA OF Siphonops annulatus ( ? ) in situ. (The body- 

 wall is slit up along the median ventral line, and its two halves reflected.) 



Intestinal tract. Oes, oesophagus ; Mq, stomach; Dd, Dd l , small intestine; 

 Dda; large intestine ; Cl, cloaca ; Bl, Bl 1 , the anterior larger and posterior 

 smaller end of the urinary bladder ; Lcb, liver ; Bis, gall-bladder ; Pan, pan- 

 creas ; If, spleen ; Per, peritoneum (gastro-hepatic omentum). 



Urinogenital organs. Ov, Ov, ovaries; Afg, Mg, Miillerian ducts (oviducts); 

 Ni, Ni, kidneys ; Ur. ureter. 



Eespiratory organs. L, well-developed right lung ; L l , rudimentary left lung ; 

 Tra, trachea. 



Organs of circulation. Ve, ventricle; At, atrium; Ba, conus arteriosus ; Ao, 

 aorta ascendens of left side : that of the right is not specially indicated ; Aod, 

 aorta descendens of left side ; Ap, Ap, pulmonary artery ; Vp, pulmonary vein ; 

 Vn, vein receiving blood from the urinogenital organs, the muscles of the back, 

 and the vertebral canal ; J, jugular vein ; Ci, postcaval ; DC, ductus Cuvieri ; 

 Vep, Vep, hepatic portal veins. 



they are shorter and more compact, and confined to the middle 

 portion of the coelome. 



In Urodeles they always consist of a narrow anterior, and a 



x 



