418 CALIFORNIA ACADEMY OF SCIENCES. 46 
¢ 
abundance by Dr. Gilbert: not yet recorded from local- 
ities further south. 
Family ATHERINID/A. 
62. Eurystole eriarcha (Jordan & Gilbert). Plate xxxii. 
One specimen found in a rocky pool by Dr. Gilbert; 
a second one taken by us with a seine on the sandy beach 
just south of Mazatlan. Only these two specimens are 
known, and the species is probably rare. This species 
is allied to the genus J/enzdia rather than to Atherina. 
It differs from the species of J/enzdza chiefly in the 
extremely long anal fin and in the smallness of its dorsal, 
which is unusually far backward. These characters have 
been used by Jordan and Evermann to define the genus 
Feurystole, of which this species is type. The mouth is 
shorter than in J/enzdza, but its structure is exactly the 
same. 
Head 5; depth-.5; ;dorsal 11—1, 10 er 12,\anal aye 
scales about 48.* 
Body short, deep, much compressed: head short, deep, 
about 4 longer than deep, rather broad above; opercles, 
truncate behind, the interorbital space about equal to eye. 
Mouth very small, terminal, very oblique, with curved 
cleft as in Jfentdia; the premaxillary very short, wide 
behind, with curved edge, slipping under the narrower 
maxillary; the premaxillary protractile, but not much 
movable; jaws subequal, the lower slightly included. 
Maxillary scarcely as long as eye, not quite reaching front 
of eye. Teeth rather large, hooked backward. Snout 
short, 3% in head. Eye large, 234 in head. Gill-rakers 
numerous, long and slender. Scales smooth, caducous, 
not easily counted, 21 before dorsal. Pectoral moderate, 


*Not to be exactly counted; the number (36-7) stated in our original 
description is an error. 
