Sharks of the Family Squalidae. 41 



Pectoral not quite reaching the vertical from the first 

 dorsal spine, which is ^ as long as the second. 



Hub. Atlantic and North Pacific, in deep water. 



In the British Museum two specimens of 720 and 750 mm. 

 in total length from the North Atlantic. With these I have 

 compared the type of C. granulosum, a specimen of 270 mm. 

 from the Falklands, and it appears to me to belong to the 

 same species. The description and figure of C. ritteri from 

 Japan lead me to believe that this species also may be a 

 synonym of C.fabricii, from which it is said to differ in the 

 shorter pectoral fin and more slender caudal peduncle. 



2. Centroscyllium nigrum. 



Centroscyllium nigrum, Garman, Mem. Mus. Corup. Zool. xxiv. 1899, 



p. 28, pis. i., iv., & v. 

 Centroscyllium ruscosmn, Gilbert, Bull. U.S. Fish. Cornra. for 1903, 



p. 581, fig. 230 (1905). 



Closely allied to C.fabricii, but the first dorsal spine is § 

 the length of the second, the pectoral extends to or beyond 

 the vertical from the first dorsal spine and its origin is equi- 

 distant from the tip of snout and the origin of the pelvics. 



Deep water of the Pacific (385 to 555fath.). Off Tropical 

 America (Garman) ; off Hawaii (Gilbert). 



3. Centroscyllium ornatum. 



Paracentroscyllivm ornatum, Alcock, Ann. & Mag. Nat. Hist. (6) iv. 

 1889, p. 379. 



Centroscyllium ornatum, Alcock, Journ. As. Soc. Bengal, lxv. 1896, 

 p. 308, and Cat. Ind. Deep-sea Fish. p. 14 (1899), and 111. Zool. ' In- 

 vestigator' Fishes, pi. viii. fig. 2, and pi. xxxv. fig. 1. 



Very similar to C. nigrum, but the terminal part of the 

 caudal fin is more produced and the lower edge has no distinct 

 posterior notch. 



Deep water of the Indian Ocean (285 to 690 fath.). 



In the British Museum a specimen of 125 mm., one of the 

 types of the species. 



2. ECHINORHINUS. 



Echinorhinus, Blainv. Bull. Soc. Philom. 1816, p. 121. 

 Goniodus, Agass. Poiss. Foss. iii. p. 183 (1836). 



This genus resembles Centroscyllium and differs from other 

 Squalidse in the form of the mouth and structure of the 

 dermal denticles. It differs from Centroscyllium in the 

 dentition, each tooth having the middle cusp very strongly 



