^^'o'"'] PROCEEDINGS OF THE NATIONAL MUSEUM. 107 



70. A-prodon corteziana sp. uov. 



Depth 8 to 9 in length ; head 4.^. 



Head high and narrow, snout broader, but long and very convex. 

 Mouth large, maxillary reaching vertical from middle of orbit, 2^ in 

 head ; eye 4| ; snout 3 ; depth of head 2. 



Teeth in premaxillaries strong, conical, in a single series; lower jaw 

 with the teeth mainly in two series, an outer row of slightly enhirged 

 teeth, and an inner row directed backwards, a wide interspace between 

 the two series with occasional scattered teeth only; posteriorly on sides 

 of mandible a single series of teeth similar to tliose in upper jaw. Vomer 

 toothless. Palatines with a single series of strong conical teeth. 



Head without conspicuous mucous pores. A strong ridge on middle 

 of occiput anteriorly. Gill slit wide, continued forwards to vertical 

 from preopercle, the width of isthmus five times in length of slit. Gill- 

 rakers short, better developed than usual, fifteen on horizontal limb of 

 outer arch. The vertical limb of arches joined to gill cover by a fold of 

 the lining membrane of the latter, as in Macrnrus. Pseudobranchiie 

 well developed. 



Origin of dorsal but little behind base of pectorals; the hinder mar- 

 gin of occiput midway between dorsal and front or middle of eye. Dis- 

 tance from snout to origin of anal 2f in total length. Ventrals inserted 

 under front of opercles, their length about three-fifths of orbit. Pec- 

 torals very large, broadly rounded, the upper portion of fin longest, the 

 lower rays rapidly shortened, the lowermost with broad, fleshy tips ; 

 rays twenty or twenty-one in number. 



Scales of the usual type, those on abdomen so deeply embedded as to 

 be almost invisible; head, anterior half of nape, breast, and base of 

 pectorals naked ; pectorals and ventrals not scaled, other fins partly 

 covered. Lateral line little developed, running along middle of sides 

 and tail. 



Color : Light-brownish, lighter below ; vertical fins broadly margined 

 with black, becoming almost wholly black behind. Pectorals light at 

 base, black distally, with a conspicuous white edge. Ventrals white. 

 Lining of mouth white, of gill cavity dusky; peritoneum black. 



Six specimens, the longest 15 inches, from Stations 2021 and 2948, in 

 339 and 26G fathoms. 



Lycodapus gen. no v. {Lycodidce). 



Body naked. Ventrals wanting. Vertical tins united around the 

 tail. Gill openings wide, continued forwards under the throat; the gill 

 membranes anteriorly narrowly united, loosely joined to the isthmus by 

 a fold of lax skin. Branchiostegals, six. No pseudobranchiie. Gills, 

 four; a wide slit behind inner arch. Gill-rakers developed. Teeth 

 present in jaws and on vomer and palatines, none of them enlarged. 

 Vent remote from the throat. 



Type: Lycodapus Jierasfer su. nov. 



