Labyrinthici and Holconoti 979 
The Embiotocide.—The group contains a single family, the 
Embvtotocide, or surf-fishes. All but two of the species are confined 
Fic. 307.—Fresh-water Viviparous Perch, Hysterocarpus traski Gibbons. 
Sacramento River. 
to California, these two living in Japan. The species are rela- 
tively small fishes, from five inches to eighteen inches in length, 
with rather large, usually silvery scales, small mouths and 
small teeth. They feed mainly on crustaceans, two or three 
species being herbivorous. With two exceptions, they inhabit 
—____ 
Fic. 308.—Hypsurus caryit (Agassiz). Monterey. 
the shallow waters on sandy beaches, where they bring forth 
their young. They can be readily taken in nets in the surf. 
