PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 459 
ON THE GENERIC RELATIONS OF BELONE EXILIS GIRARD. 
By DAVID S. JORDAN and CHARLES H. GILBERT. 
The “ needle-fish” (Belone evxilis Girard), of the California coast, differs 
from the type of the genus Belone in the development of the gill-rakers. 
In Belone vulgaris the gill-rakers are well developed, long, and slender, 
and a patch of teeth is present on the vomer. In Belone exilis the gill- 
rakers are entirely wanting, and there are no vomerine teeth. The 
gill-rakers are also wanting in the Atlantic species, Belone longirostris 
(Mitch.), Belone latimana Poey, Belone melanochira Poey, Belone notata 
Poey, and Belone hians (Cuv. & Val.), and probably also in Belone can- 
traim, which is the type of the genus Tylosurus Cocco. The generic 
name Tylosurus may therefore be provisionally adopted for the species of 
Belone without gill-rakers. The caudal keel on which the genus Tylo- 
surus was based, and which is developed in T. evilis as in T. cantraini, 
has apparently no systematic importance. 
BLOOMINGTON, IND., December 2, 1880. 
NOTES ON A COLLECTION OF FISHES FROM UTAH LAKE. 
By DAVID 8S. JORDAN and CHARLES H. GILBERT. 
A short visit to Provo, Utah, on Utah Lake, enabled one of the writers 
to make a small collection of the fishes of that locality. This collection 
has been since supplemented by an excellent series of the different spe- 
cies, presented to the United States National Museum by Peter Madsen 
and sons, fishermen at Provo. Four of the thirteen species obtained 
seem to be new to science. 
1. Cottopsis semiscaber Cope.— Bull-head. 
Two specimens. Professor Cope says of his types: ‘¢Skin prickly above 
the lateral line, smooth below it posteriorly.” Our specimens are villous 
above and below, as in Cottopsis asper, from which C. semiscaber ditfers 
chiefly in the less number of rays in the vertical fins. 
The genus Cottopsis is distinguished from Centridermichthys mainly by 
the absence of a slit behind the fourth gill, which, as I am informed by 
Dr. Giinther, is present in Centridermichthys fasciatus. Centridermichthys 
uncinatus, of the North Atlantic, agrees with Cottopsis in this respect, 
and should probably be referred to it. The American genera of Cot- 
