COLLECTED IN DUTCH NEW GUINEA. 283 



origin nearer to base of caudal than to end of snout, well behind that of anal ; 

 first spine ^ to more than •§- length of head. Anal I 22-25. Pectoral f length of 

 head. Caudal peduncle as long as or longer than deep. Brownish above, silvery 

 with narrow brownish cross-bars below ; an indistinct lateral band ; fins dusky. 



Sentani Lake, Northern New Guinea. 



Here described from two co-types, 85 and 105 mm. in total length. 



6, Centratheeina, gen. nov. 

 Eelated to Chilatherina, which it resembles in the structure of the mouth, the 

 arrangement of the teeth in the jaws, etc. It is distinguished by the toothless palate 

 and by having all the rays of the spinous dorsal pungent. 



Centratherina crassispinosa. (PI. XXXI. fig. 2.) 



Rhombatractus crassispinosus M. Weber, Nova Guinea, ix. 1913, p. 567. 



Depth of body 3 in the length, length of head 4J. Snout a little longer than 

 diameter of eye, which is 3^ in length of head ; interorbital width 3 in length of head. 

 40 scales in a longitudinal, 13 in a transverse series ; 26 in front of dorsal. Dorsal 

 IV (V), I 7 (8-11). Anal I 24 (23-26); origin well in advance of that of dorsal. 

 Pectoral f length of head. Caudal peduncle longer than deep. Olivaceous. 



Northern New Guinea. 



Here described from a co-type, 80 mm. in total length, from the Tawarin Eiver. 



7. Rhombosoma, gen. nov. 



Resembles Melanotcenia in most characters, but the well-developed horizontal 

 anterior expansion of the prgemaxillaries projects beyond the lower jaw when the 

 mouth is closed, the bands of teeth extend on to the outside of the javi's, and there is 

 no marginal series of enlarged teeth. 



Two species. 



1. Rhombosoma nov^-guine^. (PL XXXI. figs. 5, 6.) 



? ^«s^eMS 5'oZrfiei Macleay, Proc. Linn. Soc. N. S. Wales, viii. 1883, p. 269 ; Perugia, Ann. 



Mus. Genova, (2) xiv. 1894, p. 548. 

 Nematocentris novce-guinecs Eamsay & Ogilby, Proc. Linn. Soc. N. S. Wales, (2) i. 1886, p. 13. 

 Rhombatractus affmis M. Weber, Nova Guinea, v. 1907, p. 234, pi. xi. fig. 5, and ix. 1913, 



p. 565. 

 Rhombatractus kochii M. Weber, op. cit. v. p. 237, pi. xi. fig. 6, and ix. p. 562. 

 Rhombatractus weberi Regan, Ann. Mag. Nat. Hist. (8) i. 1908, p. 155. 

 Rhombatractus Catherine Beaufort, Zool. Anz. 1910, p. 250, and Bijdr. Dierk. Amsterdam, 



1913, p. 106, pl.ii. fig. 1. 

 Rhombatractus senckenbergianus M. Weber, Abhandl. Senckenb. Gesellsch. xxxiv. 1911, p. 25, 



pi. i. fig. 2. 

 VOL. XX. — PART VI. No. 2. — March, 1914. 2 q 



