308 A. Alcock — Supplementary List of Indian Fishes. [No. 3, 



caudal. Pectorals broad and falciform, several times larger than the 

 ventrals. 



Colours in spirit hyaline, occiput and caudal peduncle black. 



A single specimen about 5 inches long, and apparently mature, 

 from off the Indus Delta, 947 fms. 



It is so fragile that I am afraid to dissect it. 



§ 2. Notes on some of the previously described new forms. 



Family Splnacidse. 



Gentroscyllium ornatum, Alcock. 



Paracentroscyllium ornatum, Alcock, Ann. Mag. Nat. Hist. (6) IV. 

 1889, p. 379 : 111. Zool. ' Investigator,' Fishes, pi. viii. fig. 2. 



This species, the supposed type of a new genus, was described from 

 three very young and not very well preserved specimens from the 

 Bay of Bengal. 



Four much larger specimens — the largest nearly a foot long — have 

 lately been dredged in the Arabian Sea, and these while quite clearly 

 identical with the Bay of Bengal species, also quite clearly belong to 

 Miiller and Henle's genus Gentroscyllium., of which Paracentroscyllium 

 now becomes a synonym. The following is the amended diagnosis of 

 the species : — 



All the tissues extremely fragile. Head very large, very flat and 

 depressed, branchial regions laterally expanded. Snout much depressed, 

 polygonal : nostrils very large, situated on ventral surface of edge of 

 snout. Under surface of snout with numerous rather large pores, two 

 rows of which form an elegant Y- or V-shaped figure that extends 

 between the nostrils. Eyes very large, their major diameter nearly as 

 long as the snout and nearly a fifth the length of the head (branchial 

 region included). Spiracles rather small, situated on the upper surface 

 of the head, behind the eye. Mouth crescentic, large : minute tricuspid 

 teeth in both jaws. Body covered with minute deciduous placoid scales, 

 the spine of each scale with a stelliform base. 



Dorsal spines very strong and acute, the 2nd nearly twice the 

 size of the 1st. The 1st dorsal fin arises in advance of a point midway 

 between the pectorals and ventrals, the 2nd arises immediately behind 

 the level of the base of the ventrals. 



Colours uniform jet-black, but the integument is very deciduous. 



Family Ophidiidae. 



Neohythites, Goode and Bean. 

 In the definition of this genus the ventral fins should, I think, be 

 stated to consist of either one or two rays, so as to include MonomitopuSf 



