VOL. XIII 



"'•] PROCEEDINGS OF THE NATIONAL MUSEUM. 103 



au(l anal repeatedly subdividing. Distance of anal from snout, L'J in 

 length. 



Pectorals rounded, the lower half of fin longer than the upper, tlie 

 rays thickened. The tin contains fifteen or sixteen rays, its length less 

 than half head. Ventrals louger and slenderer than usual, each appar- 

 ently composed of two rays closely joined, their length three-fourths 

 orbit. They are inserted unusually far forwards, being in advance of 

 preopercular margin. 



Scales very small, circular, partially imbedded, covering body and 

 vertical fins. Head, antedorsal region, breast, and a strip connecting 

 the two latter embracing base and axil of pectorals, naked. 



Color: Dusky- brown, the fins, sides of head, aud belly blackish. 

 Lining of mouth aud gill cavity, and peritoneum black. 



A single specimen, 12 inches long, from Station 300D, in 857 fathoms. 



68. Lycodopsis crotalinus t^p. nov. 



Body very slender, the depth 12 in length ; head, 5^. 



With much the appearance of Li/codes jja.rillus, the cheeks tumid, 

 much projecting laterally, the greatest width of head more than h'llf 

 its length. Snout short and broad, much dei)ressed, the head scarcely 

 constricted opposite orbits. Eyes with little lateral range. 



In the single type specimen, the ui)per jaw greatly overlaps the lower, 

 the mandibular band of teeth shutting entirely within those on pre- 

 maxillaries. Maxillary reaching to behind middle of pupil, 2f in head ; 

 eye, G; interorbital width, 14; snout, 4. 



Teeth in upper jaw in a single series, two or three small teeth some- 

 times present anteriorly, giving traces of an inner series. In lower jaw 

 the teeth are sparsely set in & broad band anteriorly, becoming sud- 

 denly contracted to a single series on middle of sides. Xoue of the 

 anterior mandibular teeth enlarged, two or three of posterior teeth on 

 sides larger and hooked backwards. No teeth on vomer or palatines. 



IS'ostril in a short tube. Gill slits wide, reaching to below pectorals, 

 but not extending farther forwards below than above. Width of 

 isthmus one-third length of slit. 



A series of seven pores along mandible and preopercle ; a second 

 series of seven or eight extending from snout along sides of head above 

 premaxillaries. 



Dorsal inserted over middle of pectorals, its origin as far from occi- 

 put as is the latter from front of pupil. Distance of front of anal from 

 snout equals one-third length of body. Ventrals short, less than 

 length of pupil. Pectorals with posterior margin obliquely truncate, 

 the upper rays longest, the lower growing regularly shorter, thickened 

 at tips. The fin has fifteen or sixteen rays, the longest 2f in head. 



Scales small, imbedded, covering body and most of vertical fins. A 

 few very small, scattered scales on nape, posterior part of occiput, and 

 contiguous parts of cheeks and oporcles. Lateral line single, indis- 



