Gobioidei, Discocephali, and Tzniosomi 677 
tiver goby, of the Hawaiian streams, and Lentipes stimpsoni is 
the mountain oopu, capable of clinging to the rocks in the 
CQL LE 
Fic. 589.—Pond-skipper, Boleophthalmus chinensis (Osbeck)- Bay of Tokyo, Japan. 
(Eye-stalks sunken in preservation.) 
rush of torrents. Paragobiodon echinocephalus is a short thick- 
set goby with very large head, found in crevices of coral reefs 
of Polynesia. 
ae. 
mats v 
Fig. 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 nilsson, 
of Europe is one of this type, with the body translucent. Equally 
