PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 63 
Actual measurements of the parts are‘not given, as the proportions 
vary but little. ‘ 
Several examples were collected November 26, 1879, at a depth of ten 
fathoms, in Drake’s Bay, 35 miles north of San Francisco, by Mr. Voy, 
who has presented them to the State University, Berkeley, Cal. 
One of the types is in the United States National Museum, num- 
bered , 
This species is referred to the genus Brachyopsis, proposed by Dr. 
Gill for the reception of Agonus rostratus. 
This genus is distinguished from Agonus by the projecting lower jaw 
and consequent comparatively large terminal mouth, and by the absence 
of an isthmus. i 
DESCRIPTION OF A NEW GENUS AND SOME NEW SPECEIES OF CAL- 
GFORNEA FISHES (ICOSTEHEUS MNIGMATICUS AND OSMERUS AT- 
TENUATUDS). 
By W. N. LOCKINGTON. 
Fam. BLENNIDAi(?). 
ICOSTHUS. 
Body much compressed. Teeth in asingle row in both jaws, close-set, 
sharp. No teeth on vomer, palatines, or pharyngeals. Gill-openings 
continuous under the throat, composed of flexible rays, the anterior 
simple. 
A single long dorsal fin; anal similar. Base of pectorals fleshy. Ven- 
trals thoracic in position. Lateral line with groups of spines. Pseudo 
branchie. 
Body scaleless throughout; fins beset with spinules along the rays. 
Ktymology: ew, to yield; oczeov, bone. 
Icosteus zenigmaticus. 
Body much compressed throughout; head thicker than any portion of 
the body. Dorsal outline rising rapidly to the origin of the dorsal; 
thence more slowly in a regular curve to about the center of the length 
of the body; thence curving gradually downward to the caudal peduncle. 
Abdominal outline regularly curved. 
Upper and lower outlines of caudal peduncle concave, the peduncle 
widening posteriorly to support the fin-shaped caudal. 
Greatest depth about 54 times in total length; length of head about 5 
times in total length; eye 6; snout more than 3; interorbital width about 
23 times in the length of the head; caudal peduncle about 54 times in 
the greatest depth. 
Nostrils simple, elongate-elliptical; eyes lateral; their diameter less 
than the length of the snout; mouth-opening rather large, horizontal, 
or nearly so; tip.of the intermaxillary below the lower margin of the 
eye; margin of upper jaw formed of the intermaxillaries only ; maxilla- 
