REMOVAL OF PRONEPHROS OF AMBLYSTOMA 
379 
ber possessed well-developed anterior and posterior nephrostomes 
ending blindlj^ (figs. 14 and 15 and table 2). This would indi- 
cate that the adjacent coelomic endothelium possessed the 
Fig. 14, PN 2 Showing double anterior funnel (d./.). X 30. 
Fig. 15, PN 7 A, regenerated anterior funnel («./), on the operated side. 
regenerated posterior funnel (/>./) on the operated side. X 30. 
B, 
capacity for regeneration of this portion of the organ, even 
though, as w^e have already seen, this property is not shown by 
the tubules themselves. Of the fifteen embryos tabulated 
