err 
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in the Collection of the British Museum. 479 
the interorbital space. Snout somewhat projecting beyond 
the mouth. The second suborbital bone is twice and one-half 
as long as deep. Abdomen flat before the ventrals, compressed 
behind them. Scales with their entire margin conspicuously 
serrated. Coloration uniform. , 
Huallaga and Xeberos. 
Curimatus leuciscus. 
D.11. A.9. YV.10. L. lat.64. L. transy. =. 
The height of the body is contained thrice and two-thirds 
in the total length (without caudal), the length of the head 
four times. Upper profile of the head and nape straight. 
Snout a little longer than the eye, which is three-fifths of the 
width of the interorbital space. Snout somewhat projecting 
beyond the mouth; the second suborbital bone is more than 
tvice as long as deep. Origin of the dorsal fin equidistant 
between the end of the snout and the adipose fin, considerably 
in adyance of the ventrals, Pectoral terminating at a con- 
siderable distance from the ventral, ventral terminating close 
to the vent. Abdomen rounded before and behind the ven- 
trals. Scales with their entire margin conspicuously serrated. 
Coloration uniform. 
_ Huallaga. 
Curimatus dobula. 
Allied to C. Troschelit. 
D.12. A.10. L. lat. 43. L. transv. 6/7. 
The height of the body is contained thrice and four-fifths 
in the total length (without caudal), the length of the head 
four times. Upper profile slightly convex on the nape. Ab- 
domen rounded in front and behind the ventrals. Snout 
rather shorter than the eye, the diameter of which is con- 
tained thrice and one-third in the length of the head, and is 
less than the width of the.interorbital space. The origin of 
the dorsal fin is nearly midway between the end of the snout 
‘and the adipose fin, corresponding to the tenth scale of the 
lateral line. The pectoral fin terminates at some distance 
from the ventral. Scales with a few obtuse denticulations, 
Body silvery ; dorsal fin with an indistinct, oblique, blackish 
band ascending forwards. 
Huallaga. 
. Hemiodus Kapplert. 
Closely allied to H. notatus, but with the body much more 
elongate. | | | 
Surinam. 
