69 



The interorbital space, the breadth of which is equal to the major diameter 

 of the orbit, is deeply concave, and is traversed fore and aft by a deep median 

 groove. Each supra-orbital margin is surmounted posteriorly by a strong 

 recurved spine, and there is a similar spine on each side of the occiput. 



The body-shields are in four rows on each side : each shield is strongly 

 carinated, the carina being produced behind into a strong spine ; and in the case 

 of the shields of the posterior third of the lateral line the carinse are slightly 

 produced and pointed in front also. 



The length of the anterior ventral shields is more than twice their greatest 

 breadth. 



Colours in spirit : body flesh-coloured; the pectorals with a broad jet-black 

 band in their posterior half and with a milk-white tip ; the spinous dorsal black 

 in its upper half, and the soft dorsal with a black edge. 



Length 3^ inches. 



Off Colombo, 142 to 400 fathoms. One specimen. 

 Regd. No. 13469. 



Named after Captain A. R. S. Anderson, I.M.S., Surgeon-Naturalist to the 

 Marine Survey of India from 1893 to 1899. 



50. Pevistethhim serrulatum, Alcock. 



Peristethus serrulatum, Alcock, Ann. Mag. Nat. Hist., August 1898, p. 153: Illustrations op the Zoology of 

 the Investigator, Fishes, pl. XXV. figs. 2, 2a. 



B. 7. D. VII. 22. A. 21. L. lat. 33. 



The length of the narrow spathulate preorbital processes is equal to more 

 than two-thirds the distance between their base and the anterior border of the 

 orbit. 



Pre-opercular 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 

 post-orbital, an 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. 



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 



