'24 



BULLl^rr.V Si, UxNITED SrAtfiS NATIONAL MUSEUM. 



space five times. The nostrils are small, and are situated near the 

 border of tlie lip. The dislance between them equals from three-fifths 

 to two-thirds the interorbital spixce. The upper lip is rather full and 

 has a tbiu edge. It overhangs the lower lip, concealing the posteiior 

 part of it, and embracing it at the canthus, since it is attached within 

 the groove which bounds it below. The lower lip is decurved, and the 

 anterior part is deeper, or more conv^ex downwards, than the posterior 

 half, and is separated from the corresponding part of the opposite side 

 by a considerable intersi)ace, which is without groove. 



Fia. 3. 1-7, Necturus maculatus liaf., No, 8815, Mount Carmel, III.; 8, Siredon mexicanum Was^., larvn, 

 head ; 9, Clwndrotus tenehrosxis B. &. G., larva, head. All natural size. 



The branchial processes are undivided, and form vertical plates, wh ich 

 thin out downwards. The external and internal faces, the inferior 

 margin, and the free extremity are fringed with rather short fimbrife. 

 The anterior processes are shorter than the two others, which are sub- 

 equal. The longest about equals the length of the muzzle from the eyej 



