232 Georgiria Sioeet : 



Veins are short and enormously large, causing often deep de- 

 pressions on the ventral surface of the kidney. The ureter in 

 some specimen-^ of this species lies right outside the kidney in 

 the parietal peritoneum. Seen in transverse section [see PI. 

 XX., fig. 2], especially in the posterior half, the kidney of 

 Notaden is conspicuously unlike any of the forma so far 

 described. The vertical disposition of the tubules is very 

 strongly marked, in places forming radiating lines from the 

 midventral line of the kidney. The tubules have often pig- 

 mented walls. There is practically no " kidney-parenchyma," 

 the whole kidney being extremely vascular, more so than in 

 any other form of which I have any knowledge, though 

 Chiroleptes alboguttatus, and Heleioporus pictus are also re- 

 majrkably vascular. The extreme posterior end has compara- 

 tively small blood-spaces, but they increase very rapidly in size 

 and number forwards from this point. Along the midventral 

 line of each kidney is developed as a core or "pelvis" occupying 

 one-third to one-half the thickiifss of the kidney, a series of large 

 venous .spaces traversed or subdivided by a network of trabeculae, 

 the blood-spaces in which are connected on the one hand with the 

 Renal Veins, and on the other with the radiating blood-spaces 

 of the general kidney-substance. The general appearance of 

 the kidney microscopically is that of a groundwork of corpuscles 

 in which the tubules and Malpighian bodies are embedded. 

 The Malpighian bodies are normal in number, round and some- 

 what fimall in compai'ison with the size of the kidney. Those 

 in the outer half are often quite close to the ventral surface of 

 the kidney, while those elsewhere form two or three irregular 

 rows art: aboiit the middle of the kidney thickness. The dif- 

 ferences in structure and appearance between the necks of the 

 Capsules, the conducting, glandular and collecting tubules, 

 though i^imilar in character to that found typically as in Hyla 

 aurea, ai-e very much more strongly marked. The nuclei of the 

 cells forming the necks, and the conducting tubules stain very 

 deeply indeed with nuclear stains, so that it is only by careful 

 tracing of the tubules along their length that one can believe 

 that these parts and the glandular parts are really connected. 



hi n(^phrostomes al>o, Notaden bennetti is quite unlike pre- 

 viously-described forms. They are extremely numerous ix)s- 



