Indian Deep-sea Fishes. 153 



greatest length, measured diagonally, is nearly twice their 

 breadth, and is half again as much as the greatest length of 

 the posterior ventral plates. 



Colours in life : adults red, young dusky violet ; pectorals, 

 first dorsal, and distal half of labial tentacles black, second 

 dorsal with a black edge. 



Andaman Sea, 188-220 fath. (1891) and 405 fath. (1896). 



The largest specimen is a little over 6 inches long. 



This species appears to be near to P. platycephalum, Goode 

 and Bean, from Barbados. 



Peristetkus serrulatum, sp. n. 

 D. 7/22. A. 21. L. lat. 33. L. tr. 4. 



Head, measured from tip of preorbital process to hinder 

 angle of operculum, a little less than 2^ in the total, greatest 

 body-height a seventh of the total, without the caudal ; 

 greatest breadth of head equal to greatest length of snout. 



Preorbital processes long and narrow, their length is nearly 

 half the distance between their tip and the eye. Preoper- 

 cular ridge sharply serrulate, ending in a curved rather narrow 

 spine, which is nearly as long as the eye. All the bony 

 ridges of the head are finely serrulate or serrate ; in addition 

 there are, on either side, a preorbital, a postorbital, and 

 occipital, a post-temporal and an opercular spine, and on the 

 forehead there are at least five small spines. 



Interorbital space concave, less than the major diameter of 

 the eye, which is somewhat less than a third the greatest 

 length of the snout. 



The large labial tentacles, when laid back, reach to the 

 after limit of the orbit. 



All the shields of the body carry a stout recurved spine — 

 eight rows in all ; those of the posterior third of the lateral 

 line are not simple spines, but are acutely produced both 

 forwards and backwards. The anterior ventral plates are 

 nearly twice as long as broad and nearly twice as long as the 

 posterior ventral plates. 



Colours in spirit : flesh-colour, rather dusky dorsally ; distal 

 half of pectorals and edges of vertical fins blackish. 



Andaman Sea, 185 fath. (1897). 



Two specimens, each about 6 inches long. 



