240 Georgiiui Sweet : 



length and 3 mm. in diameter. The Vasa efferentia run 

 straight from the testis to the kidney, and then entering tlie 

 latter spread directly dorsalwards, branching to enter the 

 ventral ends of the long Malpighian caipsules, as in Bufo 

 [Spengel, '77] and Rana esculenta [Nmsbaum, '97, 1 and 2, and 

 Beissner, '98]. These canals have narrow cavities, and thin 

 walla of small cubical cells with large darkly staining nuclei, 

 and, as a rule, they stand out conspicuously in sectiom^ across 

 the kidney of this form. I have not been able to make certain 

 of the existence of a Bidder's canal in Hyla aurea, comparable 

 to that described for Bufo cinereus by Spengel ['77], and by 

 Nussbaum ['97, p. 425] for Rana esiculenta, and by Beissner 

 ['98, p. 168] for R. fu>:ca also. There is no doubt, however, 

 that the vasa efferentia do open into the Malpighian Capsules, 

 unlike R. fusca, Bombinator, Discoglossus., and Alytes [Wieder- 

 sheim, '86 p. 784], where they open either into the collecting 

 tubules (Cf. R. fusca), or into the ureter itself. As the testis 

 in all male specimens examined by me was comparatively little 

 developed, and no spermatozoa were present in the vasa effer- 

 entia, either inside or outside the kidney, it is possible tha.t the 

 Bidder's canal may be present, but small and contracted, and 

 so evade recognition. It is chiefly the Malnighian capsules near 

 the inner edge of the kidney which are thus connected with 

 the vasa eft'erentia. 



Ik'FOXIDAK. 



Fsciiiiopliryne austral is. 



Here the testes were large, flat, irregular in outline, touether 

 hiding fully two-thirds of the kidneys when viewed from the 

 ventral surface, extending also anteriorly and laterally beyond 

 each kidney. Here, as in all other forms of which male speci- 

 mens were examined, the Vasa etfereutia of each testis run in 

 the mesorchium dorsalwards to tlie kidne}' of its own side. 

 They then in Pseudophryne, enter the kidney at the outer edge 

 of the Renal Vein- without any previous branching. They 

 aijjiear to rim straight in and without forming a Bidder's 

 canal enter the Malpighian capsules at their ventral edge as in 

 Hyhi aurea. Curiously, although the testes in the specimens 

 examined are large and w^,^ll-developed, I could find no sperm 



