A CONTRIBUTION TO THE ICHTHYOLOGY 191 



Body lengthened, height in length 3,8; head in length 4,7, 

 Head posteriorly nearly as high as long. Praeorbital part of 

 head as long as its posterior part from anterior border of lower 

 eye. Eyes 11,3 in head, ^7 diameters apart. The rostral hook 

 extends to the vertical from the center of the lower eye. Left 

 (eye-) side with three lateral lines. None on the blind side. 

 Scales ctenoid on both sides. Color on eye-side light brown 

 with small light spots occupying the basal part or the scales and 

 larger, scattered, irregular light spots. Blind side pale yellowish 

 darker at the basis of the fins. 



The new species is easily distinguished from the related 

 Rh. japonica Schleg. by the ctenoid scales on the blind side. 



Jordan & Snyder have for Plagusia {Rhinoplagusia) ja- 

 ponica used a new generic name, Usmostia (Annot. Japon., 

 Ill, p. 123 and Proc. U. S. Nat. Mus., XXIII, p. 380), based 

 upon the occurrence of three lateral lines on the left side in 

 P. japonica, while in Plagusia s. str. there are only two. 

 Already Bleeker, however, on account of the same differences, 

 seperated two genera, and used for the genus to which he re- 

 ferred japonica the new name Rhinoplagusia (Atl. Ichth. Ind. 

 Or. Néerl., VI, 1866—7^2, p. 27). Consequently this latter name 

 must have priority, when we wish to separate the Plagusiae with 

 two and three lateral lines from each other. Bleeker's state- 

 ment: "Squamae latere oculari ctenoideae latere anophthalmus 

 cycloideae" must, however, on account of the squamation in the 

 present new species be excluded from the diagnosis of the genus 

 in question. 



Periophthalmus koelreuteri Pall. 

 Localities: Roebuck Bay. . . One specimen, 59 mm. 



Daly Rive, July 1894 Seven specimens, 70 — 48 mm. 



Gobius giuris Buch. Ham. 

 Locality; Daly River, July and 



August 1894 . . . Six specimens, 121 — 44 mm. 



