684 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.41. 



SQUALIOLUS LATICAUDUS Smith and Radclifie, new species. 

 Plates 50 and 54. 



Form very elongate, graceful, cigar-shaped, body moderately 

 compressed, caudal peduncle much constricted and sUghtly depressed; 

 head long, cylindrical, 3.2 in total length, its depth at spiracles equal 

 to its breadth and 3.1 in its length; body deepest under first 

 dorsal fin, the depth 2.7 in head and equal to distance from spiracle 

 to fourth gill slit; eye large, lateral, the upper margin of orbital 

 opening slightly arched, the lower margin nearly semicircular, the 

 width but slightly greater than depth and contained 7 times in head, 



2 times in interorbital space, and 2.25 times in snout; snout conical, 



3 in head, acutely pointed, the breadth somewhat greater than depth; 

 nostrils lateral, nearer to tip of snout than to anterior margin of eye; 

 interorbital space very wide and convex; spiracles large, above level 

 of upper margin of eye and separated from eye by a space nearly 

 equal to diameter of eye; gill openings very narrow, occupying a 



Fig. 4.— SQUALIOLUS laticaudus. Under side of head. Enlarged one-half. 



shallow groove that extends from pectoral through the entire series; 

 mouth rather small, nearly horizontal, its width 1.5 times diameter 

 of eye, distance of mouth from tip of snout less than .5 head, a deep 

 groove as long as width of mouth extending backward from each 

 angle; teeth in upper jaw unicuspid, erect, lanceolate, and curved 

 backward; those in lower jaw larger, oblique, with sharp point and 

 long, obhque, cutting edge, resting on a broad quadrangular base; 

 entire body and head covered with flattish denticles consisting of a 

 circular center resting on a square base, with a ridge extending from 

 each corner of the square. 



First dorsal low, with small but stout spine exposed for about half 

 its length, the posterior rays somewhat produced, the dorsal origin 

 midway between second dorsal and anterior margin of eye ; second 

 dorsal very long and low, without vestige of spine, the length of base 

 more than .3 length of head, the posterior rays produced and reaching 

 haKway from base of fin to base of caudal, original of fin over ventral 



