Sharks of the Family Squalidae. 49 



7. Centroscymnus. 



Cenfrosci/mmcs, Bocage & Capello, Proe. Zool. Soc. 1864, p. 263. 



Synopsis of the Species. 



I. Anterior labial o-rooves moderate, eacli about as long- as its distance 



from the middle of the upper jaw ; nostrils oblique. 

 Dorsal spines well developed and strongly projecting. 1. macr acanthus. 

 Dorsal spines short, slightly projecting ; dermal 



denticles not cariuate 2. ccelolepis. 



Dorsal spines scarcely projecting ; dermal denticles on 



head and on anterior part of body, except the 



sides, pluricarinate 3. oiostoni. 



Dorsal spines not projecting, hidden beneath the 



skin ; dermal denticles on head and on anterior 



part of body, except the sides, tricarinate 4. cryptacanthus. 



II. Anterior labial grooves long, each about twice as long as its dis- 

 tance from the middle of the upper jaw j nostrils slightly oblique. 



5. obsciiriis. 



III. Anterior labial grooves very long, separated by a narrow inter- 

 space ; nostrils transverse 6. crepidater. 



1. Centroscymnus macracanthus. 



Centroscipnnus macraccmthus, Regan, Ann. & Mag. Nat. Hist. (7) xviii. 

 1906, p. 436. 



Hah. Mag-ellan. 



In the British Museum oue specimen, 640 mm. in total 

 length, type of the species. 



2. Centroscymnus ccelolepis. 



Centroscymnus ccelolepis, Bocage & Capello, Proc. Zool. Soc. 1864, 

 p. 263, fig. 4 ; Vaill. 'Travailleur ' et ' Talisman ' Poiss. p. 63, pi. ii.' 

 tig. 1 (1888). 



Uab. North Atlantic, in deep water. 



In the British Museum live specimens, 250 to 1000 mm. in 

 total leno-th. 



3. Centroscymnus otostom. 

 Hah. Japan. 



Centrosajmniis oiostonii, Garman, Bull. Mus. Conip. Zool. xlvi. 1906, 

 p. 207. 



4. Ceyitroscymnus cryptacanthus. 



Centrophorus coslolepis (uon Bocage Sc Capello), Giinth. Cat. Fish. viii. 

 p. 423 (1870). 



A.7in. & Mag. N. Hist. Ser. 8. Vol. ii. 4 



