54 NEW FISHES FROM PACIFIC COAST — GILBEET. 



inentary rays above and below. The paired fius are so mutilated tliat 

 nothiui; cau be learned as to their shape or length. 



Scales large, nine in a series from ventrals forward to lateral line. 

 Lat. 1. 57; D. Ill, 17 ; A. li, 14; V. 8; P. 9. 



Color: Dark brownish, the fins blackish, head, mouth, gill-cavity, 

 and peritoneum jet-black. 



One specimen, 13 inches long, from station 3074, in 877 fathoms. 



5. Idiacanthus antrostomus sp. nov. 



Abdomen much dilated, abruptly constricted immediately behind the 

 ventral fins, aiid much narrowed also anteriorly, the depth again in- 

 creasing to occiput. Greatest depth immediately in front of ventrals, 

 one-sixteenth of the total length ; head one-twelfth. Maxillary reach- 

 ing edge of gill cover. 



Teeth in a single series in each jaw, readily depressible, varying 

 greatly in length. The teeth in the upper jaw are evidently arranged 

 in groups of four or five, the anterior member of each group being very 

 short, the others rapidly increasing backwaids, the posterior tooth very 

 long. In the mandible the lateral teeth are inserted at the extreme 

 outer edge of the jaw, but the anterior teeth are inserted farther in- 

 ward; thus the last of the anterior teeth are distinctly within the first 

 of those on sides of jaw. A single small tooth on each side of vomer, 

 and two or three posteriorly on" palatines. Three pairs of teeth directed 

 backwards from near tip of tongue. 



Eye over first third of length of maxillary. Lower jaw much longer 

 than the upper. Barbel one-third longer than the head, expanded near 

 its tip, and again narrowed as in I.ferox. 



Dorsal beginning well in advance of ventrals, its distance from tip of 

 snout 3^ in total length. The anterior rays are distant, the membrane 

 from one ray reaching only to basal portion of the succeeding ray. 

 Each ray starts behind a pair of short spinous projections which diverge 

 backwards, the fin when depressed lying in the groove formed by these 

 diverging pairs of spines. Caudal forked, the rudimentary rays ex- 

 tending well forwards on caudal peduncle, nearly meeting posterior rays 

 of dorsal and anal. Vent immediately in front of anal fin, ff.r behind 

 the dilated abdomen, its distance from end of caudal 3|- in totil length. 

 The anal is similar to dorsal. Ventrals about three-fourths length of 

 maxillary, very slender, composed apparently of five or six slender rays. 

 They are inserted much nearer front of anal than head, the former dis- 

 tance about half their distance from tip of snout. 



D. 57 ; A. ca. 35. 



Color: Black, the mandible lighter, the base and terminal portion of 

 barbel and the caudal translucent. No evident phosphorescent spot on 

 cheek. Four series of minute phosphorescent dots on abdomen, the 

 lateral series extending but a short distance behind ventrals, the me- 

 dian series uniting to form a single row behind these fiiis- 



A single specimen, 4J inches long, from station 2980, in G03 fathoms. 



