124 THE PLAGIOSTOMIA. 



Second dorsal smaller than anal, origins opposed 

 snout elongate 



teeth nearly erect, cusps narrow, serrated in upper, less in lower 

 pectorals subfalciform, reaching below mid dorsal 



limbatus (page 127) 

 snout moderate, rather pointed 



teeth serrated, upper broader, oblique . . brachyurus (page 128) 

 snout pointed before the eyes, length less than width of mouth 

 teeth serrated, upper triangular, slightly oblique 



amblyrhynchus (page 128) 

 snout blunt 



teeth serrated in upper jaw, nearly smooth in lower 



pectorals falciform .... falciformis (page 129) 

 Second dorsal smaller than the anal, origin farther backward 

 snout elongate, pointed, rather narrow 



teeth serrated, upper deeply notched, lower cusps narrow 



pectorals subfalciform velox (page 130) 



snout broad, broadly rounded 



teeth serrated, upper cusps broad, lower lanceolate 



pectorals nearly twice as long as wide . obscurus (page 130) 

 teeth serrated, upper cusps broader, lower narrowly triangular 

 pectorals broad, reaching below greater part of dorsal base 



porosus (page 131) 

 snout moderate blunt, nostrils about mid length 



teeth broad, with stronger denticles below the notch at the base 

 pectorals falciform, more than half as broad as long 



son-alt (page 132) 

 Second dorsal about equal the anal, origin farther forward 

 snout broad, short, blunt 



teeth serrated, upper broad, oblique, lower narrower 



pectorals subfalciform, longer than broad in i Hurt i (page 133) 

 teeth serrated, subequal in form and size 



pectorals longer than in C. milberti, hind margin deeply concave 



amboinensis (page 134) 

 snout short, broadly rounded 



teeth serrated, broad-based, upper cusps wider, lower nearly smooth 

 pectorals falciform, outer angle sharp . melanopterus (page 134) 



