460 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



The lateral line series of scales is separated by 5^ (5 or even 4.1) 

 rows from the origin of the second dorsal fin. There are 8 to 12 

 parallel spinous carinae on the scales of the body in -the type and 

 large paratypes, but fewer on the smaller specimens. These carinae 

 are less rugose than in the preceding two species; each is armed 

 with as many as 14 rather weak retrorse imbricate spinules, which 

 increase somewhat in size posteriorly, so that the last one projects 

 a little beyond the margin of the scale. The scales of the head are 

 much. smoother and more prefectly imbricate than in maculatus or 

 velifer, but less so than in notatus. The highly specialized ridge 

 scales of the head are so similar to those of notatus that only the 

 following diagnostic characters need be described. The dorsoterminal 

 plate is more prominent, its length being contained 4.2 (4.4 to 5.2) 

 times in the.postorbital. There are but 5 to 7 scales on the ethmoid 

 portion of the infraorbital ridge. The median occipital scute is 

 armed by a single strong keel in the type, while in some of the 

 paratypes a smaller pair of divergent* lateral carinae are added; in 

 all the specimens except one paratype, an additional scute, not so 

 strongly modified, is located on the mid-dorsal line at the end of the 

 first third of the distance between the first scute and the origin of the 

 dorsal fin. The median of the three seiies of scales between the 

 occipital and postorbital ridges is markedly enlarged. A few small 

 scales posteriorly partially replace the prickles which in C. notatus 

 largely cover the fossa within the anterolateral margins of the snout; 

 this region is consequently naked to a wider extent. The carinae on 

 the opercular scales are mostly subparallel. The under surface of 

 the head, the gill-membranes, and the nasal fossa are completely 

 scaleless. 



The fins are essentially like those of related species. The simi- 

 larity apparently includes the sexual dimorphism as regards the 

 length of the fins, but the data for this species are meager, as in many 

 cases the fins are broken. 



Tabic showing length of fin-rays in the two sexes. 



Male. 



Type. 



Paratypes. 



Female. 



Paratypes. 



Length of second dorsal spine 

 Length of third dorsal ray . . . 



Length of pectoral fin 



Length of outer ventral ray. . . 

 Length of second ventral ray 



0.94 



1.55 



1.9 



1.67 



3.0 



0.093 to 0.096 



1.4 

 1.75 to 2.0 

 1.6 tol.9 

 2.95 to 3. 32 



2.1 to 2. 15 

 2.0 to 2. 05 

 3.5to3.6 



Base of the first dorsal contained 1.25 (1.0 to 1.4) times in the in- 

 terdorsal space, and 1.5 (1.4 to 1.8) times in the postorbital length 

 of the head. The origin of the anal lies below either the middle or 

 the posterior part of the interdorsal space. 



