812 CALIFORNIA ACADEMY OF SCIENCES. © 
inent; bones of head cavernous, largely made up of car- 
tilage; anterior end of preorbital forming a blunt spine 
over mouth; process of premaxillary prominent; a couple 
of blunt projections behind each eye; upper part of 
shoulder girdle projecting, forming a blunt spine on nape 
above gill-slit; a row of large pores around suborbital 
7 ring, and along under part of mandible; no opercular 
spines. 
Head and body covered with a very loose, naked, mov- 
able skin; dorsal fin continuous; no notch between spines 
and soft rays; the spines very slender, the first one in- 
serted over end of opercular flap; the last rays reach to 
the base of caudal fin; anal lower than dorsal, its origin 
midway between base of caudal fin and posterior mar- 
gin of eye, ending at about the same point that dorsal 
does, but not reaching so far;' pectorals long and slen- 
der, reaching past front of anal and over half way be- 
tween their bases and base of caudal fin; they are adnate 
to the body for the anterior third or fourth of their length; 
ventrals long, not quite reaching to vent, adnate to the 
body for half their length; caudal fin rounded. 
Color light olivaceous; body and head with innumer- 
able dark points giving the fish a dusky appearance; a 
large dark blotch across body at the posterior end of the 
dorsal and anal; a similar spot under pectoral; head uni- 
form dusky, lighter below; belly white, middle of pectoral 
dark; dorsals dark; lower fins white. 
A single small specimen dredged, 1% inches in length. 
It is numbered 3129 on the register of the Leland Stan- 
ford Jr. University Museum. 
This species is the type of a strongly marked genus, 
distinguished from Psychrolutes by the very long dorsal 
and anal fins and by the form of the mouth. It is named 
for Dr. Charles Henry Gilbert, who has contributed 
