f 
‘ : ig. 1, a, 
right pharyngeal of Ciamposto- 
Ma anomalr 
L. Agassiz on the Ichthyological Fauna of Western America. 219 
This shows plainly that however closely allied, they are types of 
different genera, and I shall introduce the name of Cam postoma 
for the American form. ‘The scales bear a close resemblance to 
those of Exoglossum ; their longitudinal diameter however pre- 
vails over the vertical and the radiating furrows diverge more 
graph, I shall not enter into further particulars respecting this 
genus, remarking only that the species of Campostoma assume 
a very different appearance in different periods of the year, accord- 
ing to their sexes; Exoglossum spinicephalum of Valenciennes, 
for instanca, being the male in its breeding dress of the same spe- 
cies Dr. Kirtland has described under the name of Exoglossum 
dubium. Leuciscus prolixus Storer again, is synonymous with 
every respect with it. This name anomalus being by many 
Species, were the dorsal not described as having 15 rays. Some 
of the species described lately as Chondrostoma from the Old 
World may belong to this genus. 
represents the 
Saba sides, and e, the same from ¢ 
the Inner side to show the a 
Stinding surface. 
1 
b 
* See this Jourval, vol, xvii, p. 357. 
