PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 5 
A second example of Xystreurys Uiolepis, taken at Santa Barbara, is 
sinistral. The species is, therefore, like Paralichthys maculosus and 
Platichthys stellatus, both dextral and sinistral. In the second example 
the small accessory scales are extremely numerous. 
Two more examples of the species, noticed by us as Platysomatichthys 
stomias, have been obtained in trawl-nets from near the Farallones. 
This species is apparently not congeneric with Platysomatichthys hippo- 
glossoides, differing in the long and slender gill-rakers and the ctenoid 
scales, as well asin the dentition, narrow interorbital space, and other 
minor details. The large teeth in both jaws, and the small teeth in the 
outer row in the upper jaw, are distinctly arrow-shaped, being abruptly 
widened toward the tip, thence acutely triangular. 
We propose to consider this species as the type of a distinct genus, 
which may be termed Atheresthes, from the arrow-shaped teeth. It may 
be thus defined : 
Atheresthes gen. noy. 
Eyes and color on the right side. Body long and slender, closely 
compressed, tapering into a long and slender caudal peduncle. Mouth 
extremely large, oblique, the long and narrow maxillary extending 
beyond the eye. Both jaws with two irregular series of unequal, sharp 
teeth, which are anteriorly long and slender, posteriorly short. All the 
long teeth of both jaws, and the outer series of small teeth in the upper 
jaw, arrow-shaped. Some of the anterior teeth freely depressible. In- 
terorbital space narrow. Gill-rakers longand strong, numerous. Scales 
comparatively large, ciliated, thin, and readily deciduous, those on the 
blind side similar, smooth. Lateral line without arch. Fins low and 
rather fragile, the dorsal beginning over the eye, its anterior rays low. 
Caudal lunate; no anal spine. Pectorals and ventrals small, the latter 
both lateral. 
Type, Platysomatichthys stomias Jor. & Gilb. 
NOTES ON SHARKS FROM THE COAST OF CALIFORNIA 
By DAVID S. JORDAN and CHAS. H. GILBERT. 
The following species of sharks, not hitherto recorded from the Pacific 
coast of the United States, have been observed by the writers during 
the present winter (1880) : 
1. Isurus oxyrhynchus Rafinesque. (?) 
The jaws of a species of Iswrus were obtained by us at San Pedro, the 
shark having been taken off Santa Catilina Island. The teeth agree 
essentially with those of Isurus oxyrhynchus (Lamna spallanzani of 
authors). Iswrus glaucus has, however, also the same dentition, hence 
we are unable exactly to determine the species. 
