456 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



ones usually with several divergent ridges, the posterior ones with 

 but the single median keel persistent in the larger specimens. The 

 median occipital scute is armed by a rather strong median keel, and 

 from one (as in the type) to three lateral divergent series. A simi- 

 lar but smaller scute, located near the origin of the lateral line, is less 

 strongly developed than in G. maculatus. The area between the 

 occipital and postorbital ridges is largely covered by three longitu- 

 dinal series of scales, similar to those on the body ; those in the median 

 series, although the largest, are not so much enlarged as in C. macu- 

 latus. As in C. maculatus, five series of scales occupy the area be- 

 tween the occipital ridges; the scales of the median series are the 

 largest, and bear seven or fewer carinae (in the type). The scales 

 bounding the superior rostral ridge form an area similar to that of 

 C. maculatus, but are in other respects quite dissimilar: they are 

 arranged in a single series on each side; they are of subquadrate out- 

 line, and they are armed in a peculiar and diagnostic fashion: 

 each scale is sharply divided into two regions by that diagonal which 

 extends from the anterolateral angle across the scale to the inner 

 posterior angle; the posterolateral triangular area, thus outlined, is 

 armed by several (four to six in type) parallel or subparallel spinous 

 carinae, while the inner-anterior triangular area bears but one or 

 two spinous ridges coursing inward and backward. The area within 

 the anterolateral margins of the snout, mostly scaleless in C. macul- 

 atus, is largely covered with prickles in C. velifer. The under side of 

 the head, including the branchiostegal membrane, and also the nasal 

 fossa, are wholly naked. 



The first dorsal spine is short but sharp, the second is long and 

 filamentous, with a base grooved on its three sides; the anterior edge 

 of the spine is rounded, and is constantly wholly spineless. The base 

 of the first dorsal is a little shorter than the interval between the 

 dorsals. The second dorsal is not so rudimentary anteriorly as it 

 often is, the first ray being contained 4.5 times in the orbit. The anal 

 fin is inserted a little in advance of the vertical from the origin of 

 the second dorsal. The second ventral ray in the type reaches to 

 between the anus and the anal fin. 



Table of measurements of length of fins 1 i)i the unties, young males, and females. 



1 Expressed in the number of times each ray or fin is contained in the head, 

 is summarized from measurements on 30 specimens. 



The table 



