’ 
o4 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 
RHINOBATIDZ:. 
53. Rhinobatus productus Ayres. 
Very common. 
GALEORHINID. 
54. Mustelus californicus Gill. 
Abundant. This species appears to be identical with the Atlantic 
Mustelus canis, itself indistinguishable from Mustelus hinnulus Blainville, 
of the Mediterranean. 
55. Triacis semifasciatus Grd. 
Not uncommon. 
56. Galeocerdo sp? 
The jaws of a large shark, with the teeth similar in both jaws, triangu- 
lar, oblique, deeply notched on the outer margin, and all strongly ser- 
rate, are preserved by Mr. Pitcher, of San Diego. The shark was taken 
near San Diego, but south of the Mexican line. The width of the 
mouth is about a foot. I suppose this to have been a species of Gale- 
ocerdo. 
HETERODONTID. 
57. Heterodontus francisci (Grd.) Jor. & Gilb. 
Common. 
DESCRIPTION OF A NEW FLOUNDER (XYSTREURYS LIOLEPESS), 
* FROM SANTA CATILINA ISLAND, CALIFORNIA. 
By DAVID S. JORDAN and CHARLES H. GILBERT. 
XYSTREURYS LIOLEPIS, gen. et sp. nov. 
GENERIC CHARACTERS.—Subfamily Hippoglossine, allied to Hippo- 
glossina, Hippoglossoides, and Paralichthys (PSeudorhombus). Fyes and 
color on the right side; mouth large, oblique, with the teeth developed 
on both sides, stout, unequal, bluntish, in a single series; gill-rakers few, 
short, thick, almost triangular; scales small, cycloid, membraneous, ob- 
long in form; lateral line simple, arched over the pectorals; caudal fin 
double-truncate, the angles rounded; dorsal fin beginning over the eye ; 
anal fin preceded by a feeble antrorse spine; ventrals lateral; body ob- 
long, moderately deep, rather thin. 
This genus differs from Hippoglossoides in the arched lateral line, and 
from Hippoglossina in the cycloid scales and in its dextral habit. From 
most of the related genera it is separated by the few stout short gill- 
rakers. 
