492 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



hynchus and C. acantkolepis, in which but 44 secies occupy the space 

 between origin of second dorsal and lateral line, the different count 

 being due to the course of the lateral line, which in those two species 

 rises on the trunk to the next horizontal scale row above the one it 

 occupies on the tail. The carinae, numbering 7 to 10 on each scale of 

 the body, are low, divergent ridges, bearing comparatively very weak 

 spinules. The dorsoterminal plate is not prominent and is armed 

 by about 8 rows of spinules; there follows, on the ethmoid portion 

 of the infraorbital ridge, 7 scales on one side, 6 on the other; then 

 9(8) greatly strengthened scales with one or a few rows of spinules 

 on the preorbital portion (in a single series) ; 6 (5) scales, still in 

 a single series, cover the suborbital region of the ridge, and it is only 

 upon the preopercular portion that the scales are in two series; 

 the ridge ends in a sharp point located in front of preopercular 

 margin a distance contained 4.7 (6.0 on right side) times in postor- 

 bital. The area between the orbit and the infraorbital ridge is 

 scaled ; the portion below the anterior half of orbit with small scales 

 bearing only a few spinules; the portion below posterior half of 

 orbit and extending backward to the preopercular ridge, with scales 

 small but much better developed than in the preceding two species; 

 each one bears 2 to 6 divergent spinous carinae. Nine subquadrate 

 scales, with several carinae directed outward and backward, cover the 

 superior rostral ridge ; these scales are bounded by a single series of 

 scales with numerous carinae, outward from which a narrow groove 

 runs forward to the naked anterolateral region of snout, as in C. 

 acantkolepis. The scales on the occipital riclge are rather weaker 

 than in C. platorhynckus, but are otherwise similar; most of them 

 bear a single spinous keel; the postorbital and the posterior half of 

 the supraorbital ridges are covered by scales quite similar to those 

 on the occipital ridges. All of the spinules of the occipital scute but 

 one are arranged along the median keel. The scales between the 

 occipital ridges are armed by three to seven carinae, and are arranged 

 in about five rows. The scales between occipital and postorbital 

 ridges bear numerous carinae; these scales are enlarged in a median 

 series; the scales on the exposed part of opercular bones and on the 

 cheek behind the eye are similar to those on the body. The nasal 

 fossa and the underside of the head are completely naked. 



Length of first dorsal base, contained 1.2 times in the interdorsal 

 space and 1.6 times in the postorbital length of head. The first 

 dorsal spine is short, the second almost as long as the postrostral 

 length of head (contained 1.7 times in head) ; length of pectoral, 

 1.9 in head ; inner ventral rays, 3.6. 



Color, broAvnish, much lighter than in C. platorkynckus and C. 

 acantkolepis; under side of head light brown (instead of blackish), 

 the rami of mandibles, and the gular and branchiostegal membranes, 



