424 DR. A. GUNTHER ON NEW FISHES FROM PERU. [Juve 10, 
The upper jaw projects beyond the lower, the teeth not being covered 
by the lips. Snout scarcely longer than the eye. Head very broad, 
the interorbital space very convex, its width being equal to the length 
Pit 
Megalobrycon cephalus. 
of the postorbital portion of the head. The coloration appears to 
have been uniform. 
The specimens are 13 inches long, and in a bad state of preserva- 
tion. 
CHIRODON ALBURNUS. (Fig. 2.) 
D..10. A. 20. L. lat. 37. LL. transv.. 11. 
The height of the body is a little more than the length of the head, 
and one-fourth of the total (without caudal). Upper profile of the 
head not concave. The pectoral does not extend to the ventral. 
Teeth scarcely compressed, pointed, with a minute (microscopical) 
Chirodon alburnus. 
lobe on each side; there are about twelve in the upper and eighteen 
in the lower jaw. Sides with an ill-defined silvery longitudinal band ; 
the middle caudal rays blackish. 
Two and a half inches long. 
