1893] 



NEW YORK ACADEMY OF SCIENCES. 



243 



larvse of Rana clamata (= R. fonlhinlis), I observed that the 

 cloacal aperture was usual]}' placed distinctly to the right of the 

 middle line. 



Yeutrally, at the point where the tail joins on to the body. 



Fi^.l. 



Fig- 2. 



Fig.3. 



d----_ 



Explanation of Figs. 1-3 : Three tadpoles of Raua clamata from 

 ventral aspect. Slightly enlarged ; in, mouth ; ap, spiraculum ; /, looso 

 fold of integument; r, raphe of tail; d, cloacal apfrturo. The dottetl 

 line in Fig. 1 indicates the limits of the peri-branchial chamber. 



