134 PROCEEDINGS OF THE ACADEMY OF [1879. 



interval between the two dorsals; from Cybium by the latter 

 character; and from all these genera by the absence of teeth on 

 either vomer or palatines. From Auxin it differs in the absence 

 of a corslet, in the larger size of the teeth, and in the greater 

 number of dorsal spines. Etymology, xpsta want, ixtrpa. stomacher, 

 viz., corslet. 



Chriomitra concolor, sp. nov. 



D. 15 17, VII. A. 1 17, VIII. 



Teeth in a single row, triangular, compressed, those of lower 

 jaw largest, none near the symphysis, fceven or eight finlets be- 

 hind the dorsal, eight behind the anal; pectoral one-eighth of the 

 total length to the end of the central caudal rays, ventrals small, 

 in length less than |th of the pectorals. 



Description. Dorsal outline a regular gentle curve from snout 

 to tail, ventral outline similar to that of dorsal. 



Cleft of mouth slightly oblique, maxillary reaching to a vertical 

 from the hinder margin of the eye; its anterior part concealed 

 behind the preorbital when the mouth is closed. 



Jaws equal in front, teeth in a single row on the jaws, none on 

 the vomer or palatines. Teeth in lower jaw larger than those in 

 upper, compressed at base, gently curved inwards ; those in upper 

 jaw much smaller, compressed, triangular, straight. 



Length of head slightly exceeding the greatest depth, and con- 

 tained about five times in the total length. 



Eye slightly oval, its longitudinal diameter contained seven 

 times in the length of the head; snout a little more than one-third 

 of the same length, tapering regularly to the tip; and convex 

 above, as is also the whole upper surface of the head. 



Hinder margin of preoperculum with a long shallow sinus, its, 

 lower angle extending a little farther back than its upper extremity; 

 lower border almost straight, horizontal. Hinder margin of oper- 

 culum and suboperculum a regular curve. 



Distance from tip of snout to origin of first dorsal contained 

 about 4^ times in the length to end of central part of caudal ; its 

 length of base very slightly less than its distance from tip of 

 snout. Second, third, and fourth dorsal spines highest, thence 

 diminishing rapidly in height to the tenth, the remainder short 

 and apparently isolated. 



