Sharks of the Family Squalidas. 51 



Length of base of second dorsal (without the spine) 

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

 |- to 3 the interspace between the two 5. squamosum. 



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) G. foliaceus. 



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



2| iu 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 pluricariuate 8. acus. 



II. Posterior angle of pectoral fin considerably produced and acutely 

 pointed. 



A. Distance from mouth to nostrils 1^ 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. lusitanicus. 



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

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

 to tj 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. bragancm. 



2. Spine of second dorsal \ exposed ; length of base of first dorsal 



(? without the spine) f the distance from 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) \ the distance from the second . . 13. moluccensis. 



1. Centrophorus hystricosus. 



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

 p. 206. 



J lab. Japan. 



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 aciculatum, Garm. Bull. Mus. Comp. Zool. xlvi. 1906, 



p. 207. 



4* 



