Fishes of the Western North Atlantic 



8i 



8 E) usually tridentate (occasionally with one of the lateral points lacking), with a 

 prominent axial crest and two (occasionally only one) lower lateral crests, loosely to mod- 

 erately-closely spaced and overlapping but little j those along rear half of upper margin 

 of caudal fin much larger than on trunk, smooth, ovoid in outline, forming a visible ridge. 

 Head flattened above. Snout broadly rounded and short, its length in front of mouth 



Figure 8. A-E Hexanchus griseus, female, 830 mm. long, from Nice, France (Harv. Mus. Comp. Zool., 

 No. 946), with dermal denticles, about 18 x. f Left-hand upper and lower teeth of an 1 1 -foot Cuban speci- 

 men, about Y2 natural size. 



Figure 9. A Hexanchus griseus, new-born female, 429 mm. long, from Havana, Cuba (Harv. Mus. Comp. 

 Zool., No. 35630). B First lower tooth of the Il-foot Cuban specimen illustrated in Fig. 8f, about 1.5 x. 



