4-94 Memoir Sears Foundation for Marine Research 



as a weakly defined lobe, its axis raised at an angle of about 30° to 40° ; inner corner of 

 pectoral broadly rounded, not at all produced; luminous organs lacking. 

 Range. Both sides of North Atlandc; South Africa; Japan. 



Key to Species* 



I a. Length of snout in front of mouth considerably less than distance from eye to ist gill 

 opening. coelole-pis Bocage and Brito Capello, 1864, p. 494. 



lb. Length of snout in front of mouth at least as great as distance from eye to ist gill open- 

 ing. 



2a. Length of snout about as great as distance from eye to ist gill opening; ist dorsal 

 about as large as 2nd dorsal. juscus Gilchrist and von Bonde, 1924. 



South Africa.^ 

 2b. Length of snout definitely greater than distance from eye to ist gill opening; ist 

 dorsal smaller than 2nd dorsal. 



3a. Tips of dorsal spines exposed; tip of 2nd dorsal extends back considerably 

 beyond tips of pelvics. owstoni Garman, 1906. 



Japan. 



3b. Tips of dorsal spines concealed by skin; tip of 2nd dorsal extends only as far 

 back as tips of pelvics. cryftacanthus Regan, 1 906. 



Madeira. 



Centroscymnus coelolefis Bocage and Brito Capello, 1864 



Portuguese Shark 



Figures 94, 95 



Study Material. Two adult females, 1,1 17 and 1,080 mm. long, taken off Banquereau 

 Bank in 200 to 270 fathoms (Harv. Mus. Comp. ZooL, No. 35144? 35237)} also very 

 young male, about 328 mm. long, from the continental edge south of Nantucket, Lat. 39° 

 51' N., Long. 70° 17' W. (U.S. Nat. Mus., No. 118396). 



Distinctive Characters. Among the local members of the suborder, Centroscymnus is 

 marked off from Squalus acanthias, S. cubensis, Centroscyllium and Etmopterus by the 

 following: its fin spines protrude so little from the skin that they are apt to be overlooked 

 (cf. Fig. 94 with 87, 89, 91, 92) ; while its teeth have only one cusp in each jaw, the lowers 

 and uppers are strikingly unlike. Owing to the inconspicuous nature of its spines it might 

 perhaps be confused with small specimens of Somniosus, which it resembles in the general 



1. Centrofhorus crepidaler Bocage and Brito Capello, 1864, from Portuguese waters, was referred by Garman 

 (Mem. Harv. Mus. comp. Zool., 36, 1913: 207) to his new genus Centroselachus because of the pluricarinate 

 scales, but by Rey (Fauna Iberica Feces, /, 1928: 449) to Centroscymnus, but it falls in Scymnodon as here de- 

 fined, likewise Centroscymnus macracanthus Regan, 1906, from the Straits of Magellan and Argentina. 



2. Known only from the type specimen. 



