94 RAFINESQUE’S ¢ 
fossil shells. They consist in 4 naked mollusca, of the genus Limaz, 
36 fluviatile univalve shells, 34 terrestrial univalve shells, 42 fluvia- 
tile bivalve shells, and 70 fossil bivalve shells. Such as—(*these are 
fossils) Helix, 4 species ; Planorbis, 2; Ancylus, 1; Mesomphix, 
N. G. t. univ. 12; Trophodor, N. G. do. 10; Triodopsis, N. G. do. 
2; Stenotoma, N. G. do. 1; Toxostoma, N. G. do. 1; Xolotrema, 
N. G. do. 1; Aplodon, N. G. do. 1; Lymnula, 13; Pleurotoma, N. 
G. fl. un. 12; Ellipstoma, N. G. do. 4; Bulimus, 1; Eurystoma, N. 
G. fl. un. 1; Notrema, N. G. do. 1; Ambloxis, N. G. do. 4; 
*Voluta, 2; *Solarium, 2; *Belemnites, 3; *Trochus, 3; *Ortho- 
cera, 5; *Toxerites, N. G. un. 1; *Endotoma,-N. G. do. 1; 
*Platinites, N. G. do. 1; *Trigorima, N. G. do. 1; *Euomphales, 
1; *Patella, 2; *Melanites, 2; Mytilus, 1; Lepas, 1; Potamila, 
N. G. fl. biv. 84; Truncilla, N. G. do. 3; Stenodon, N. G. do. 3; 
Pleuroxis, N. G. do. 2; *Saconites, N. G. L; *Gryphea, 5; *Ostrea, 
2; *Terebratula, 24; *Productus, 15; *Spirifer, 2; *Tellina, 1; 
*Goniclis, N. G. biv. 2; *Cyphoxis, N. G. do. 5; *Megorima, N. 
G. do. 4; *Oxisma, N. G. do. 1; *Curvula, N. G. do. 3; *Apleu- 
rotis, N. G. do. 2; *Pachosteon, N. G. do. 1. 
[356] 
Description of a new Genus of Fluviatile Bivalve Shell, of the 
family of Brachiopodes ; NOTREMA FISSURELLA; %n a Letter to 
Dr. S. L. Mitchill, Prof. of Nat. Hist. &c., New York. 
Dear Sir: 
There is a small family of bivalve shells, which have received the 
name of Brachiopodes, distinguished by having tentacula. It con- 
tained, in my Analysis of Nature and in Cuvier’s Regne Animal, 
only three genera, lingula, orbicula and terebratula, all maritime ; 
this last, whicn is very numerous, particularly in fossil species, has 
lately been divided by Sowerby, who has established the genera Pro- 
ductus and Spirifer; and I have added another fossil genus. 
Apleurotis, distinguished from it by being elongated, obliquated, 
_and auriculated on one side only, in a memoir presented to the 
Academy of National Sciences of Philadelphia. 
In my travels on the Ohio, I have ascertained another genus 
belonging to that family, which is very similar to the genus Orbi- 
cula; but it is fluviatile, and the larger or upper valve is perforated 
in the middle as in /isswrella, and operculated. I have not seen 
the living animal myself; but Mr. Audubon of Hendersonville, a 
zealous observer, has drawn it, and it appears to have a head with 
. 
