16 



Spiracles very small, their diameter less than half that of the pupil, situated 

 immediately behind and below the eye. 



Mouth large crescentic, a short labial fold at the angles only. Teeth in 

 broadish bands in both jaws, small, mostly tricuspid (sometimes 5-cuspid) the 

 middle cusp much the largest. Surface of palate and of tongue papillated. 



The entire surface of the skin closely covered with minute stony tricuspid 

 spines. 



The first dorsal fin, which arises just ahead of the vertical through the 

 after end of the base of the ventrals, is larger than the second, which is about 

 opposite the anal : the base of the anal is about twice as long as that of either 

 dorsal. The pectorals are at least twice as big as the ventrals, and the latter 

 have a very oblique posterior margin. 



Colours : dull stone-grey, rather lighter ventrally. 



Andaman Sea, 188-220 fathoms, 185 fathoms, 370-419 fathoms, and 405 

 fathoms. 



The largest specimen is a female 11 inches long. 



Regd. Nos. 13120 type of male: 1J* type of female: 2 f fi : a38_JLai. 



382 385. 

 1 - 1 • 



4. Scyllium canescens, Giinther. 



Scyllium canescens, Giinther, Ann. Mag. Nat. Hist. (5) II. 187S, p. 18 : Challenger Deep Sea Fishes, p. 1, pi. i., 

 fig. A : Alcock, J. A. S. B., Vol. LX V., pt. 2, 1896, p. 310. 



Differs from 8. hispidum, if my identification be correct, in the following 

 particulars : — 



(1) the snout is slightly longer, relatively : 



(2) the eye is slightly smaller : 



(3) the labial folds at the angles of the mouth are slightly larger : 



(4) teeth tricuspid, the cusps subequal : 



(5) the body is covered with simple stiff prickles : 



(6) the fins have much the same position, but the second dorsal is slightly 

 larger than the first, and the base of the anal is not so extensive. 



Colours in spirit blackish with a hoary gray surface. Some of the fins, as 

 in some specimens of Scyllium hispidum, may be tipped with white behind. 



A single small specimen from the Arabian Sea, 690-620 fathoms. 



Regd. No. ^ 8 . 



[ The type of this species was dredged by the Challenger, off the south- 

 western coast of S. America at a depth of 400 fathoms. ] 



Distribution. Patagonian fjords : Arabian Sea : at considerable depths. 



