ON THE SPECIES OF THE GENUS ANOSTOMUS. 23 
AnOSTOMUS PLATiE, Sp. 11. 
D. 12 ; A. 11 ; V. 9 ; L.l. 45 ; L. tr. _L. 
4(5) 
Mouth opening forward, lower jaw a little longer, teeth 
crenulute in both jaws. Length of snout equal to that of 
the eye. Depth of body three and one-half, or length of 
head four and two-thirds tin)es in the total length, with- 
out the caudal. The ninth ray of the dorsal fin is over 
the middle of the leno;th. The row of scales from the first 
ray of the ventral toward the hinder part of the dor- 
sal leads to the third ray from the end of the latter. 
There are six rows of scales between the lateral line and 
the dorsal and four between the line and the first ray of 
the ventral or five from the line to the median ventral se- 
ries. This species is stouter in front of the dorsal and 
more decurved about the occiput than A. isognathus; it 
has larger scales and a smaller number of rows on the ven- 
tral region. 
Color silvery, back darker, with lighter streak on the 
middle of each scale ; a faint spot at base of caudal. 
Hab. Rosario, La Plata. 
Anostomus nasutus Kn. ; Gth. 
Mouth opening obliquely downward and forward, lower 
jaw sh<n-ter, teeth crenulate in upper and lower. Six series 
of scales between the lateral line andthe dorsal, five between 
the line and the ventral, and seven between the line and 
the median row of the belly. From the darker lateral 
edges of the scales, the body has the appearance of be- 
ing longitudinally streaked with dark. The caudal spot 
fades out gradually forward as in A. isognathus. Fifteen 
specimens from the llio Puty. 
