Sharks of the Family Squalidse. 49 



7. Centroscymnus. 

 Centroscymnus, Bocage & Capello, Proc. Zool. Soc. 1864, p. 263. 



Synopsis of the Species. 



I. Anterior labial grooves moderate, each about as long as its distance 



from the middle of the upper jaw ; nostrils oblique. 

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

 Dorsal spines short, slightly projecting ; dermal 



denticles not carinate 2. coslolepis. 



Dorsal spines scarcely projecting ; dermal denticles on 



head and on anterior part of body, except the 



sides, pluricarinate 3. owstoni. 



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 ; nostrils slightly oblique. 



5. obscurus. 



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

 space ; nostrils transverse 6. crepidater. 



1. Centroscymnus macracanthns. 



Centroscymnus macracanthus, Regan, Ann. & Mag. Nat. Hist. (7) xviii. 

 1906, p. 436. 



Flab. Magellan. 



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

 length, type of the species. 



2. Centroscymnus coehlepis. 



Centroscymnus coehlepis, Bocasre & Capello, Proc. Zool. Soc. 1S64, 

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

 fig. 1 (1888). 



Hab. North Atlantic, in deep water. 



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

 total length. 



3. Centroscymnus oiostoni. 



Centroscymnus oiostonii, Garman, Bull. Mas. Comp. Zool. xlvi. 1906, 

 p. 207. 



Hab. Japan. 



4. Centroscymnus cryptacanthus. 



Centrophorus ccelolepis (non Bocage & Capello), Giinth. Cat, Fish, viii, 

 p. 423 (1870). 



Ann. & Mag. N. FFist. Ser. 8. Vol. ii. 4 



