BY J. DOUGLAS OGILBY. 745 



overlapping in a kind of neutral zone which lies somewhere about 

 the altitude of Penrith, where both species occur abundantly. 



Besides the specimens enumerated above, I have to thank Mr. 

 W. J. McCooey for three examples oljtained in the neighbourho(jd 

 of Camden; and more especially am I indebted to Mr. M. P. 

 Gorman, of Burragorang, for three magnificent series forwarded 

 during the months of October and November from the Wollon- 

 d illy and "a small creek in the mountains away from the river 

 altogether.'' These series are fully illustrative of the growth of 

 the fish between the lengths of 33 and 138 millimeters, and the 

 opportunity of examining them in a fresh condition has enabled 

 me to thoroughly satisfy myself as to the identity of richardsonii 

 with KrefFt's species. 



Fifty-three specimens have been examined in the preparation 

 of this article, the largest measuring just 180 millimeters. 



Ophiorrhinus, gen.nov. 



Eleotris, s]}- auctt. 



Body rather elongate, compressed posteriorly, the back broad 

 and flat in front of the dorsal fin, rounded behind ; head very 

 large and strongly depressed, much wider than deep, the snout 

 short and very obtuse; mouth large and but little oblique, the 

 lips thin, premaxillaries but little protractile; maxillaries narrow, 

 with the distal end exposed and linear ; lower jaw much the 

 longer; jaws with a broad band of cardiform teeth, all of which are 

 fixed; lower pharyngeals forming together a subtriangular patch, 

 armed with small, stout, hooked teeth, a few at the apex and 

 along the symphysis somewhat enlarged ; nostrils moderately 

 separated, the anterior vahular ; eyes sublateral ; none of the 

 bones of the head armed; gill-openings extending forwards to 

 below or before the angle of the mouth, the isthmus about half as 

 wide as the interorbital space; six branchiostegals; pseudobranchite 

 present, small; gill-rakers short and rather slender, mostly serru- 

 late. Dorsal fins separate, with vii, i 9-10 rays, the spinous ones 

 flexible; anal fin originating behind the second dorsal, with i 9-10 

 rays; the last soft rays of the second dorsal and anal tins divided 



