248 (jcorglna Sweet : 



per. = Peritoneum. 



11. A. = Renal artery, 



R. P. V. = Renal portal vein. 



R. V. = Renal vein. 



R. Vj. = Main branch of Renal vein. 



t. = Testis. 



t. c. c. = Transverse collecting canal. 



ur. =^ Ureter. 



ur. t. = Uriniferous tubule. 



V. c. c. = Vertical collecting canal. 



V. e. =: Yas efferens. 



V. t. c. ^ Ventral transverse canal. 



All fiirures except Fig. 1 were drawn by the aid of the Camera 

 lucida. 



Fuit'liK 1. 



Transverse vertical sectiim through both, kidneys and tester 

 of Hyla aurea), showing general structure and relationships of 

 kidney and Testis. The blood capillaries among the tubules 

 are much too small to be shown in this figure. x 12. 



FiGURK 2. 



Transverse vertical section through the kidney of Notadcn 

 bennetti, showing the tendency to form a " hilus " and the 

 mai'ked vasoulairity compared with that of Hyla aurea. The 

 testis is not represented in the figure-, but is enclosed by the 

 mesorchium lying on the outer side of *. The section drawn 

 is one taken through the region where the nephrostomes are 

 least numerous ; one, however, is showai at X, its openings 

 being in succeeding sections. x 12. 



Figure 3. 



Sniall portion of ventral edge of a transverse vertical section 

 across the kidney of Limnodynastes dorsalis, showing the in- 

 ternal (i.o.n.) and external (e.o.n.) openings of a typical 

 nephrostome ; iund its relationships to the blood-spaces (b. sp.) 

 and uriniferous tubules (ur. t.). The blood-spaceis marked ± 

 an<l +, communicate directly witli each other in the sec! ion 



