280 MR. C. TATE BEGAN ON EEESHWATEE PISHES 



Neoatherina australis Casteln. t. c. p. 32. 



Aristeus fitzroyensis Casteln. Proc. Linn. Soc. N. S. Wales, iii. 1878, p. 141. 



Aristeus fluviatilis Casteln. I. c. 



Aristeus rufescens Macleay, Proc. Liun. Soc. N. S. Wales, v. 1880, p. 625. 



Aristeus lineatus Macleay, t. c. p. 626. 



Aristeus cavifrons Macleay, ib. vii. 1882, p. 70. 



Aristeus perpei-osus De Vis, ib. ix. 1884, p. 694. 



Aristeus loricB Perugia, Ann. Mus. Geneva, (2) xiv. 1894, p. 549. 



Nematocentris tatei Zietz, Rep. Horn. Exped. ii. p. 178, fig, 2 (1896). 



Nematocentris winneckii Zietz, t. c. p. 179, fig. 3. 



Melanotcenia maculata M. Weber, Nova Guinea, v. 1907, p. 239, pi. xi. fig. 4. 



MelanotcBnia ogilbyi M. Weber, Notes Leyden Mus. xxxii. 1910, p. 230, and Nova Guinea, ix. 

 1913, p. 560, fig. 28. 



Rhombatractus2)atotiM.YfeheT,Ah\\2MA\. Senckenb. Gesellsch. xxxiv. 1911, p. 26, pi. i. fig. 3. 

 Depth of body 2 J to 3 J in the length, length of head 3f to 4f . Snout about as long 

 as diameter of eye, which is 3 to 3 J in the length of head ; interorbital width 2f to 

 2| in the length of head. One or two series of scales on cheek. 12 to 16 gill- 

 rakers on lower part of anterior arch. 33 to 37 scales in a longitudinal series (from 

 above opercular cleft to base of caudal), 11 to 13 in a transverse series. Dorsal V- 

 VII, I 9-12 (13); origin above or in advance of that of anal. Anal I 16-21 (22). 

 Caudal peduncle as long as or longer than deep. Olivaceous above, silvery below. A 

 blackish lateral band may be present or absent; sometimes it is developed only 

 posteriorly ; when it is absent a bluish lateral stripe may be seen. Sometimes there 

 are silvery-white stripes along and dark red or brown ones between the series of scales. 

 Fins plain or spotted. 



Southern New Guinea ; Aru Islands ; Australia south to the Swan River, Fincke 

 River, Murrumbidgee River, and Sydney ; probably in the sea as well as in fresh water. 

 Here described from a large series of specimens up to 100 mm. in total length, from 

 ISew Guinea, Northern, Western, Central, and Eastern Australia, including the type of 

 the species and co-types of M. ogilhyi, N. tatei, W. winneckei, R. patoti, and A. lorice, 

 the last kindly sent to me by Dr. R. Gestro. 



2. Rhadinocentrus, gen. nov. 

 This genus differs from Melanotamia in having all the spinous dorsal fin-rays slender 

 and flexible, and also apparently in having the palate toothless. 

 A single species. 



Rhadinocentkus ornatus, sp. n. (PI. XXXI. fig. 1.) 



Depth of body 3| in the length, length of head 3f . Snout ^ diameter of eye, which 

 is 2|- in the length of head and equal to the interorbital width. Mouth oblique and 

 lower jaw somewhat projecting. 33 to 35 scales in a longitudinal series, 8 or 9 in a 



