HALAELURUS CANESCENS. 87 



little more than half the length of the distance from the caudal. Caudal short, 

 not so deep as the other fins. Scales minute, tricuspid. 



Greyish brown; back with indistinctly defined cross bands of darker, and 

 with scattered spots of lighter and of darker on back and fins. 



Off the coasts of Chile. 



Halaelurus alcockii, sp. nov. 



Scyllium canescens Alcock, 1896, Journ. Asiatic soc. Bengal, 65, p. 310; 1899, Cat. deep-sea fishes 

 Indian mus., p. 16. 



Alcock's comparative description of this species proves satisfactorily that 

 it is not S. canescens of Giinther, 1878. The differences appear in a snout 

 that is slightly longer relatively, an eye that is smaller, in larger labial folds, in 

 the simple stiff prickles of the scales, in a larger second dorsal, and in a shorter 

 anal for H. alcockii. The comparisons were made with H. hispidus, but it 

 will be seen that they are even more decisive if that species is compared with 

 H. canescens. 



Greyish black, "almost black, blackish with a hoary gray surface." 



Arabian Sea, 690-620 fathoms. 



Halaelurus canescens. 



Scyllium canescens GtJNTHER, 1878, Ann. mag. nat. hist., ser. 5, 2, p. 18; 1887, Challenger rept. Zoo!., 



22, p. 1, pi. 1, f. A. 

 Scyliorhinus canescens Regan, 1908, Ann. mag. nat. hist., ser. 8, 1, p. 461. 



Snout short, blunt, length of preoral portion less than its width. Anterior 

 narial valves not reaching the mouth, widely separated from one another; the 

 description says each valve is provided with a cirrus, but none is shown in 

 the figure. The width of the mouth is greater than the length of the snout; 

 there is a short labial fold on each jaw, around the angle. Teeth small, tricus- 

 pid on the lower jaw with subequal cusps. Eye large. Spiracles small, close 

 to the angle of the eye. Dorsals, anal, and ventrals subequal. First doisal 

 slightly shorter than the second, origin above the middles of the bases of the 

 ventrals. Hind margins of the ventrals oblique, bases ending below the middle 

 of the dorsal. Second dorsal origin above the middle of the anal base. Anal 

 fin not reaching as far back as the end of the base of the second dorsal. Sub- 

 caudal more than twice the length of the anal base. Shagreen rough. Type 

 specimen an 11 inch female. 



Uniform greyish; caudal tipped with darker; other fins tipped with white. 



Southwestern coast of South America, in 400 fathoms. 



