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Memoir Sears Foundation for Marine Research 



denticulate (the larger scales resemble more the bucklers of certain skates than those of 

 other sharks), irregularly distributed, either singly and wide-spaced or in groups of 3 to 5, 

 in which case they may be so closely crowded that their circular outlines are more or less 

 lost, or the adjoining denticles may even be more or less fused. 



Figure 102. A, Echinorhinus briicus, eastern Atlantic specimen, about three feet long, in British Museum. 

 B Head of same from below. C Dermal denticles. D Upper and lower teeth a little longer than natural size. 

 E Third upper tooth, about z x. F Upper and lower teeth, after L. Agassiz. 



Head flattened above. Snout ovate, tapering from eyes. Eye opposite front of mouth, 

 approximately circular, its horizontal diameter Yz to V2 as long as snout in front of mouth. 

 Spiracle posterior to eye by a distance a little longer than diameter of latter. Gill openings 

 slightly oblique, the 5th about twice as long as ist or about as long as snout in front of 

 mouth and more than twice as long as diameter of eye (thus much larger than in any other 

 member of the suborder). Nostril about midway between tip of snout and corner of mouth, 

 its anterior margin with a pointed lobe. Mouth crescentic, about V2 as high as broad (thus 

 more strongly arched than in other local Squaloidea). Labial furrows confined to corners 

 of mouth. 



Teeth ^°|°^g, alike in the 2 jaws, each with a pointed median cusp usually flanked by 

 I small cusp on the inner side and 2 on the outer though described as sometimes*' with- 



4a. Rey, Fauna Iberica, Feces, i, 1928: 485. 



