NO. I9i;3. FISHES OF OKINAWA— S:NYDER. 515 



CTENOGOBIUS GYMNAUCHEN (Bleeker). 



One specimen about 40 millimeters long was secured near Naha. 

 It is very light in color, but differs in no other way from Japanese 

 examples. 



MAPO CRASSICEPS Jordan and Seale. 



This species is rather common in the pools near Naha. It is easUy 

 distinguishetl from similar looking gobies by the short, rounded 

 ventral disk, the anterior part of which is markedly fleshy. The 

 Okinawa sjiecimens differ in no way from Samoan examples. All have 

 scales on the upper part of the opercle. 



MAPO FUSCUS (Ruppell). 



Only 5 small examples were secured from the pools. Tongue 

 immarginate; occiput scaled, sometimes lo the eyes, although a 

 narrow, naked space may usuall}'' be found just behind the eyes; 

 snout rather pointed; chin with somewhat distinct, brown spots; 

 sides with large brown clouds iuul many narrow indefinite stripes, the 

 latter easily distinguishing tlic species from G. poccilicMhys, wiiich it 

 resembles in general appearance. 



MAPO iEOLOSOMUS (Ogilby). 



Numerous individuals of this species collected in the pools at Naha 

 differ in no way from specimens collected at Lord Howe Island by 

 Mr. E. R. Waite. The species is also found in Samoa, having been 

 recorded as G.fuscus, "young with dark crossbands." 



The teeth are in narrow bands on the jaws; none on the vomer and 

 palatines. The outer teeth of the upper jaw are enlarged and curved, 

 the inner ones small except one or two on each side which are con- 

 siderably enlarged. The outer row on the lower jaw are much en- 

 larged, one or two on each side being canine-like and especially 

 strong. The tongue is emarginate. 



AMBLYGOBIUS NARAHAR^ Snyder. 



Plate 68, fig. 2. 

 Amhh/gobius naraharse. Snyder, Proc. U. S. Nat. Mug., vol. 35, 1909, p. 101. 

 Tide pools at Naha. 



PERIOPHTHALMUS CANTONENSIS (Osbeck). 



Abundant on the flat tidelands where thousands may be seen in 

 long skirmish lines advancing ahead of the incoming tide or following 

 the receding water. 



ZONOGOBIUS SEMIDOLIATUS (Cuvler and Valenciennes). 



Numerous specimens 38 millimeters long were found in the rock 

 pools. The species also occurs at Tanegashima. 



XENISTHMUS PRORIGER Snyder. 



Plate 68, fig. 3. 



Xenislhrnus proriger Snyder, Proc. U. S. Nat. Muf., vol. 35, 1909, p. 105. 

 Pools at Naha. 



