Gobioidei, Discocephali, and Tzniosomi 677 
river goby, of the Hawaiian streams, and Lentipes stimpsoni is 
the mountain oopu, capable of clinging to the rocks in the 
—— ZZ 
Fig. 589.—Pond-skipper, Boleophthalmus chinensis (Osbeck). Bay of Tokyo, Japan. 
(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. 
~~ 
Fic. 590.—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 mnilssont, 
of Europe is one of this type, with the body translucent. Equally 
