146 Mr. A. Alcock on 



little spicules on the dorsal surface of the snout, as well as on 

 parts of both the dorsal and ventral surfaces of the antero- 

 lateral margin. There is a row of three large spines on the 

 middle line of the nape, and there are at least two rows of 

 smaller spines on the posterior fourth of the disk, in the 

 middle line. 



The tail is as long as the disk and is armed, both on the 

 dorsal surface and on the sides, with rows of spines, those on 

 the sides being smaller and more numerous than those on the 

 dorsum. 



The caudal fin, which is present on the dorsal surface only, 

 is confluent with the second dorsal. 



The teeth form a pavement; in the female in the upper 

 jaw they are indistinctly tricuspid (the lateral cusps very 

 small and blunt;, in the lower jaw they are more distinctly 

 tricuspid. 



Colours: upper suiface warm brown, with a pair of large, 

 light-centred, light-edged, chocolate ocelli near the middle of 

 the back. 



A female, 12^ inches long, from the Gulf of Martaban, 

 67 fath. (Temperature probably about 62° Fahr.) 



Named in memorv of Lieutenant Powell, of the Indian 

 Navy, Captain Moresby's colleague. 



PHYSOSTOM1. 



Family Scopelidae. 



Bathypterois, Giinther. 



Bathypterois atricolor t Alcock. 



Bathypterois atricolor, Alcock, Journ. As. Soc. Bengal, vol. lxv. pt. ii. 

 1896, p. 306, and Illustrations of the Zoology of the 'Investigator,' 

 Fishes, pi. xvii. fig. 6. 



This species was described and figured from a single injured 

 specimen. 



The number of dorsal and anal rays is sometimes less than 

 in the type specimen ; the number of pectoral rays is alto- 

 gether 14, and the two detached rays reach at least as far as 

 the end of the caudal fin. 



The curious notch at the ventral base of the caudal fin is 

 present in every specimen dredged. 



This species appears to come nearest to B. dubius, Vaillant. 



Off Laccadives, 891 fath. ; off Maldives, 459 fath. ; off 

 Cape Comorin, S24 fath. 



