466 Gobioidei, Discocephali, and Taniosomi 
river goby, of the Hawaiian streams, and Lentipes stimpsont is 
the mountain oopu, capable of clinging to the rocks in the 
Fic. 420.—Pond-skipper, Boleophthalmus chinensis (Osbeck)- 
(Eye-stalks sunken in preservation.) 
tush of torrents. Paragobiodon echinocephalus is a short thick- 
set goby with very large head, found in crevices of coral reefs 
of Polynesia. 
Bay of Tokyo, Japan. 
Fie. 421.—Mud-skippy, Periophthalmus oarbarus (L.). Mouth of Vaisigono River 
Apia, Samoa. : 
In numerous interesting species the first dorsal fin is wanting 
or much reduced. The crystal goby, Crystallogobius mnilssoni, 
of Europe is one of this type, with the body translucent. Equally 
