339 
Idiacantlms antrostomus GILBERT 
Id iacanthus antrostomus GILBERT, Proc# IJ.S.Nat# Lltis•, vol.13, 1890, p#54# Off 
California coast, 603 fathoms# - GOODE and BEAN, Oceanic Ichth#, 1895, p.516 
(reference)# - JORDAN and EVERMAlfflf, Bull# T J#S.Nat# Mus#, No#47, pt#l, 1896, 
p#605 (copied)# - PARR, Bull. Bingham Oceanogr. Collection, vol.3, art.3, 
Dec. 30, 1927, p#118 (note). - REGAN and TREWAVAS, Danish Dana Exped. Oceanogr« 
Rep#, No.6, March 10, 1930, p#132 (compiled). 
Depth 16 in total length; head 12, Width 2 2/3# Snout 3 l/2 in head from 
snout tip; eye 4 2/3, over first third of maxillary, 1 l/5 in snout, greater trian 
interorbital; maxillary reaches hind edge of gill opening; lower jaw protrudes; 
upper teeth in 2 groups of 4 or 5, anterior in each very short and others rapidly 
graduated longer so hind tooth very long; lower lateral teeth at extreme outer 
jaw edge, anterior inserted farther inward; single small tooth each side of vomer 
and 2 or 3 posteriorly on palatines; 3 pairs of teeth on tongue directed back; 
barbel 1 l/3 times head, expanded subtermxnally; interorbital 6 in head from 
snout tip# No gill rakers; gill filaments 1/2 of eye# 
Pour rows of minute uhotoohores on abdomen, lateral row extends out short 
space behind ventral and median series unite to form single row behind ventral# 
D# 57, begins well before ventral, space from snout tip 3 l/3 in total length, 
front rays more widely spaced; A. 35, like dorsal; caudal forked, rudimentary 
rays extend forward nearly to dorsal and anal; ventral 1 l/3 in kaxillary, rays 
5 or 6, fin inserted much nearer front of anal than head# 
Black, mandible paler# Base and terminal part of barbel and caudal fin trans¬ 
lucent # 
Pacific Ocean. 
44286 TJ.S.N.M. In 603 fathoms. Albat ross Station 2980# Length 98 mm. 
Type. 
