Sharks of the Family Squalidffi. 51 



Length of base of aecond dorsal (without the spine) 

 f that of the first (without the spine), which is 

 f to ^ tlie interspace between tlie two 5, squamosus, 



2. Dermal denticles tricuspid and tricarinate ; second dorsal a 



little shorter than the first. 

 Length of base of first dorsal (without the spine) 2| 



to 3 in the distance from the second ; length of 



snout (in front of the eye) 3| in the length of 



head (to first gill-opening) 6. foliaceus. 



Length of base of first dorsal (witliout the spine) 2 to 



2? in the distance from the second ; length of 



snout (in front of the eye) 2| to 2\ in the length 



of head (to first gill-opening) 7. steindachneri. 



3. Dermal denticles pluricarinate 8. aais. 



II. Posterior angle of pectoral fin considerably produced and acutely 

 pointed. 



A. Distance from mouth to nostrils \\ that from nostrils to end of 



snout. 



1. Spine of second dorsal h to % exposed. 

 Length of base of second dorsal (without the spine) | 



that of the first (without the spine), which is ^ 



the interspace between the two 9. hisitanicus. 



Length of base of second dorsal (without the spine) § 

 that of the first (without the spine), which is f 

 to f the interspace between the two 10. granulosus. 



Length of base of second dorsal (without the spine) f 

 that of the first (without the spine), which is ^ 

 the interspace between the two 11. hragancce. 



2. Spine of second dorsal | exposed ; length of base of first doi'sal 



(? without the spine) | the distance ironi the second. 



12. tessellatus. 



B. Distance from mouth to nostrils more than twice that from 



nostrils to end of snout ; length of base of first dorsal (without 

 the spine) f the distance from the second . . 13. molucceusis. 



Acanthidium hystricosum, Garm. Bull. Mus. Comp. Zool. xlvi. 1906, 

 p. 206. 



Centrophori/f! hyfitricosxis. 

 'strico. 



Hob. Ja|)an. 



2. Centrophorus calceus, 



Acanthidium calceum, Lowe, Proc. Zool. Soc. 1839, p. 92. 

 Centrophorus calceus, Giinth. Cat. Fish. viii. p. 423 (1870) ; Vaill. 



* Travailleur ' et 'Talisman ' Poiss. p. 71, pi. iii. fig. 1 (1888) ; Collett, 



Rep. Norweg. Fish. ii. p. 21 (1905). 

 Centrophorus crepidalbus, Bocage & Capello, Proc. Zool. Soc. 1864, 



p. 262, fig. 2. 

 Deania eqlantina, Jord. & Snyd. Proc. U.S. Nat. Mus. xxv. 1902, p. 80 ; 



Jord. & Fowler, ibid. xxvi. 1903, p. 632, fig. 

 ? Acanthidium aciculattim, Garm. Bull. Mus. Comp. Zool. xlvi. 1906 



p. 207. 



4* 



