84 RAFINESQUE’S 
a zigzag form in the middle, inside silvery white, teeth subequal, 
much curved. Length 2-3, diameter 2-5, axis 5-12 of the breadth. 
Also from the river Jellinghy. Small, hardly one inch. This 
and the last agree in many points, and might form a peculiar sub- 
[7] 
genus Hemisolasma, having shell ovate, axis submedial, lamellar 
teeth subequal. 
118 Sp. Unio fulgens, [ Lampsilis fulgens. | 
Shell thick, elliptical, swelled, attenuated behind, outside nearly 
smooth, laminated, ferruginous brown; inside of a_ beautiful 
metallic incarnate and iridescent. Length 1-2, diameter 1-3, axis 
1-5 of the breadth. 
From the river Ganges, two or three inches, beautiful shell, a true 
Lampsilis, with a long flexuose lamellar tooth suberenulate ; cardinal 
tooth compressed crenulate. Anterior fossule, very conspicuous 
below the anterior impression. 
119 Sp. Unio Argyratus, [Lampsilis argyratus. | 
Shell thin, elliptical, swelled, attenuated behind, outside laminated 
greenish, decoricated and silvery at the summit, inside bluish irides- 
cent. Length 1-2, diameter 1-3, axis 1-16 of the breadth. 
Also from the river Ganges. Size one and ahalf inch. Very 
near to the S. G. Leptodea, but teeth as in the last, cardinal small 
crenulate, lamellar less flexuose, not crenulate. In both the teeth 
are wide apart as in all the Lampsilis. 
120 Sp. Unio corrugata, of the authors from the riyer Baramputra, 
it is an Obliquaria, very near to my U. Venus and U. Elliptica, 8. 
G. Aximedia. In Mr. Poulson’s cabinet, I have not yet been able 
to determine precisely whether it is well named, and not having the 
specimen before me, I cannot describe it. 
10 N. G. LONCOSILLA. 
Shell transversal, unequilateral, somewhat gaping, only one mus- 
cular impression anteriorly. No teeth as in Anodonta, but a hinge 
with a marginal nerve, or fold anteriorly ; distinct from the margin, 
and a little obliqual behind. Ligament small at the very summit.— 
Animal unknown. 
A distinct genus of the tribe Anodonta, which had been mistaken 
for a fluviatile Solen by Dr. Burroughs the discoverer of it ; but all 
the Solens are marine shells. The name means little knife ; it is 
different from all my 8S. G. of Anodonta. 
