262 INDIAN CYPRINID&. 
still however the preponderance of species in favour of India is so remarkable, 
that it is only by extending our consideration to other genera of the order 
Malacopterygii abdominales that we find the equilibrium restored in the 
distribution of fresh-water fishes. Thus the Salmonide which form a large 
proportion of that order in the rivers of both Europe and America, are 
in India quite unknown, not one species of that extensive family having yet 
been found in this country, where the blank appears to be filled up by the 
excessive development of the Cyprinide. 
54. One species of Tench,* four Leuciscs,t and one Gudgeon,} are enu- 
merated among the fossils of Giningen by M. Agassiz, who also describes 
two new genera§ Rhodeus and Apius, nearly allied to, but distinct from 
the Perilamps and Systoms. They are distinct from the first, by the dorsal 
and ventral margins being equally arched, and the caudal and anal fins being 
less developed ; and from the second, by the absence of spines in either of 
the latter fins; both belong however to Sarcoborine, and will serve to render 
that group far more complete “than it appeared to me to be before I saw 
M. Agassiz’s splendid work. Two fossil species of Cobitine are also found in 
the same locality, one of these, C. cephalotus Agass. belongs to Schistura. 
The marlstone in which these remains are found is justly considered by M. 
Agassiz to be a lacustrine deposit, and supposed to be coeval with the molasse 
of Switzerland and the sand stone of Fontainbleau. and consequently to cor- 
respond with the miocene or early tertiory period. 
* Tinca leptosoma, Agass. Recherches sur les Poissons Fossiles, vol. v. t. 51. 
+ Leuciscus papyraceus, Agass. V. t. 36. L. leptus, Agass. V. t. 57. L. pusillus id. 1. e. 
L. eningensis id. and L. heterurus id. 1. ¢. 
+ Gobo analis, Agass. t. 57 
§ Rhodeus elongatus, Agass. t. 54. and R. /atior id. |. c. Of the genus Apdus, M. Agassiz 
describes A. gracilis, and A. brongiarti, V. t. 55.; but the latter as well as Leuctscus papyraceus 
are from the lignites of Menat. 
