472 



PROCEEDINGS OF THE ACADEMY OF 



[Oct., 



slight silvered reflections, and greenish tints on head and fins evidently 

 due to preservative. Iris a little reddish-brown. Length 7f inches 

 (caudal damaged). 



The others show: Head 2f to 2^; depth If; D. I, ii, 13, i to 16, i; A. 

 I, III, 28, I to 31, i; scales about 67 to 78 in lateral line to base of 



Serrasalmus immaculatus (Cope). 



caudal, and 6 to 8 more on latter; mandible If to 2| in head; pectoral 

 l| to If; ventral 2f to 3^; least depth of caudal peduncle 3^ to 3f ; 

 base of dorsal If to If; snout 4f to 4^ in head, measured from tip 

 of upper jaw; eye 4^ to 5; maxillary 2f to 2|; interorbital space 3 to 

 3^; greatest width of infraorbital rim 2f to 3; length of body (caudal 

 damaged) 6^ to 6| inches. Though the dusky posterior caudal margin 

 is evident, the numerous lead-colored spots on the back are not. 



Subgenus COLOSSOMA Eigenmann. 



Anterior and posterior series of teeth in upper jaw close together. 



Colossoma ooulus (Cope). 



Mijletes oculus Cope, Proc. Acad. Nat. Sci. Phila., 1871 (1872), p. 262, PI. 12, 

 fig. 2. Cotypes, Nos. 7,991 (type) to 8,010, A. N. S. P. Ambyiacu 

 River. John Hauxwell. 



Width of head 2 in its length ; interorbital space 2^ in head, measured 



