560 PROCEEDINGS OF THE ACADEMY OF [DeC. ; 



CHAULIODONTID^E. 

 Chauliodus sloani Schneider. 



Head 5; depth (of head) about 7; depth (at dorsal origin) about 

 13; D. 6; A. 12; P. 15; V. i, 5; scales about 52 (according to pockets 

 and pigment spots) in median lateral series; about 7 scales in trans- 

 verse series (pockets) at dorsal origin; about 5 scales in transverse 

 series between adipose dorsal origin and that of anal (pockets 

 counted); head width about 3 in its length; head depth at occiput 

 about If; mandible If; rayed dorsal base 3; anal base 2; lower 

 caudal lobe (damaged) about If?; pectoral (damaged) about 

 If?; snout 4 in head measured from upper jaw tip; eye 4; maxil- 

 lary 1 T V; interorbital 4-jj anterior mandibular fang If. 



Body greatly elongated, slender, tapering evenly back to caudal 

 base from head, at which point greatest depth, sides compressed 

 and edges rounded. Caudal peduncle slender, compressed, its least 

 depth 2f its length. 



Head compressed, deep, obtuse in front, flattened sides not con- 

 verging above or below, upper profile a little convex and lower nearly 

 horizontal. Snout short, ending in short obtuse constricted process, 

 about broad as long. Eye circular, anterior about first third in 

 head length near upper profile, which deeply concave in course just 

 before eye. Mouth very large, not completely closing, with upper 

 jaw edge well inclined and lower jaw edge nearly horizontal. On 

 each side of upper jaw anteriorly, or in preniaxillary, first tooth 

 slender, simple, thin, slightly curved and awl-shaped. Second 

 tooth longer and stouter with an obsolete terminal barb, third 

 similar to second, but shorter than first, and fourth like third only 

 trifle longer, but not long as first. Maxillary with a series of com- 

 pressed short attenuated teeth along lower edge, graduated to first 

 third, after which of about uniform length. Maxillary extends 

 obliquely down straight to mandible articulation or hind preopercle 

 edge. Mandible with 7 pairs of large canines, first enormous, 

 slender, curved slightly back, and when mouth closes extend up along 

 each side of snout well above upper eye edge, tip of each with small 

 barb behind. Second pair simple and slender, about f length of 

 first. Third trifle curved back at tip, about half length of first, 

 others all graduated down smaller than second and similar. In 

 upper jaw on left side directly after base of first canine another, 

 but depressible transversely across roof of upper jaw. A similar 

 and slightly longer one behind base of second right canine. Each 

 palatine with 7 short conic straight teeth, first about f length of 



