Fishes of the Wester ti North Atlantic 



535 



tour truncate or concave, its lower anterior margin longer than the upper anterior margin 

 (a relationship the reverse of that which obtains in all other sharlcs) ; caudal peduncle with 

 a faintly defined longitudinal ridge along each side; claspers of males extend only a little 

 beyond pelvics, even in adults, and are attached to inner margins of fins nearly to tips of 

 latter;" dermal denticles on dorsal side conical, on broad bases, those on ventral side flat, 

 with scale-like blades. Characters otherwise those of family and suborder. 



Range. Continental waters on both sides of the Atlantic, including the Mediterra- 

 nean, north to the Shetlands and Cape Cod and south to northern Argentina; South Africa 

 (Natal); west coast of America from Chile to southern Alaska; Japan, Korea, Australia 

 and Tasmania. 



Fossjl. From Upper Jurassic to Pliocene, Europe; Upper Cretaceous, western Asia; 

 Upper Cretaceous to Miocene, North America; Eocene, Africa. 



Figure 103. Margins of right-hand nostrils of different species of Squatina: A, australis from Australia 

 (Harv. Mus. Comp. Zool., No. 659), about 3 x. B, Left-hand nostril of same, to show asymmetry. C, squatina 

 from the Irish Sea (Harv. Mus. Comp. Zool., No. 846), about natural size. D, argentina from Uruguay 

 (U. S. Nat. Mus., No. 87684), about 1.5 x. E, japonica from Japan (Harv. Mus. Comp. Zool., No. 1 112), 

 about 2 X. F, californica from California (Harv. Mus. Comp. Zool., No. 952), about 2.5 x. G, dumeril 

 from off New York (U. S. Nat. Mus., No. 11 8461), about 1.5 x. H, armata from Mejillones Island, Peru 

 (Harv. Mus. Comp. Zool., No. 531), about 1.5 x. 



13. For account, see Leigh-Sharpe (J. Morph., 55, 1921 : 373). 



