84 ANNUAL REPORT OF 



were first united by J. H. Redfield in his report presented to the 

 American Association of Geologists and Naturalists in 1845, but 

 were again separated by Professor Newberry on the ground of 

 their seeming to present slight differences in the proportions of 

 length and depth — appearances due to varying conditions of 

 preservaton. The principal characters distinctive of this species 

 may be enumerated as follows : 



D. 10; C. 15; A. 10; P. 10. 



A gracefully fusiform species attaining a total length to the 

 base of the caudal fin of about 15 cm., in which the length of 

 the head and opercular apparatus is contained three and one- 

 half times. The maximum depth of trunk, which is equal to 

 about one-fourth the total length, occurs midway between the 

 head and dorsal fin, where there are about 20 longitudinal rows 

 of scales. Lateral line scales about 33. Dorsal fin arising at 

 mid-length, pelvic nearer to anal than to the pectoral pair, arising 

 opposite a point directly in advance of the dorsal. Caudal not 

 much forked. Anal with 10 rays, partly opposed to hinder half 

 of the dorsal, its origin being on the third oblique scale-row in 

 advance of the dorsal fin. Dorsal fin-fulcra about 12, anal 10, 

 ventral and pectoral 10 each. Apparently four dorsal fin- fulcra 

 originate on the dorsal margin over the interneurals. The fifth 

 dorsal fulcrum has its origin adjacent to that of the first ray 

 (Fig. 12), and is about equal in length to one-half the anterior 

 margin of the fin. Scales smooth and not serrated posteriorly, 

 the deepest ones occurring in the fourth row behind the clavicular 

 arch; these are about twice as deep as they are wide in their 

 exposed portion. Dorsal ridge-scales acuminate. 



