307 

 4. Chilatherina Tate Regan. 



(TATE REGAN, Trans. Zool. Soc. London XX. prt 6, 1914, p. 282). 

 Much compressed, oblong. Dorsal profile strongly elevated 

 and convex in old specimens, less so in young ones. Ventral 

 profile much convex. Head rather pointed. Upper jaw more 

 or less prominent. The intermaxillaries are gently curved, 

 without abrupt bent between the horizontal and the lateral part. 

 Lips more or less thickened, especially the upper lip. Jaws 

 with several rows of pointed teeth, reduced to one row 

 laterally. Teeth on vomer and base of tongue; those on pala- 

 tines absent or present. First dorsal with a spine and 3 5 

 soft undivided rays. Second dorsal with one curved spine and 

 10 16 soft rays. Anal with a weak spine and 22 25 soft rays. 



Fig. 82. Chilatherina sentaniensis (M. Web.) X 9 /io- 



Origin of anal in advance of that of first dorsal. Ventrals with 

 a slender spine and 5 soft rays, beginning somewhat behind 

 origin of pectorals, which have no spine. Caudal deeply forked. 

 Scales smooth or indistinctly crenulated at their hindmargin; 

 rather small, 40 42 in a row between head and caudal. Lateral 

 line absent or indicated by some scales having a shallow pit. 

 Six branchiostegals. About 14 short gillrakers on the lower 

 part of the anterior arch. 



Distribution: Freshwater of Northern New Guinea. 



Key to the i ndo-australian species of 

 Chilatherina. 



1. Head 4.3 5.8. 19 21 scales in front of dorsal. 13 16 



soft dorsal rays Ch. fasciata p. 308. 



2. Head less than 4. 2227 scales in front of dorsal. 



lo 12 soft dorsal rays Ch t scntaniensis p. 309. 



