s 
a S. G. of Melanict f bnt the animal is 
different, with lateral feelers; the 
shell is always conical oblong with 
the opening oblong oblique acute at 
both ends, columella flexuose twist- 
ed. 
20. Fleurocera Acuta , Raf. 1818. 
Shell elongate very acute, smooth, 
nine spires, the first angular in front. 
Lake Erie. 
21., Fleurocera i Quadrosa, Raf. 
1816. Conical, smooth, six spires, 
the first with an obtuse circular an- 
gle, and a furrow below it, giving 
the opening a subquadrangular ap- 
pearance. Small streams of West 
Kentucky, one inch long. 
22. Melania Rugosa, Raf. Py- 
ramidal acute, nine spires, rugose 
vertically, streams of Cumberland 
Mountains.. I leave tire name of 
Melania ta the shells with opening 
obtuse at the end, or th ey may form 
the S. G. Ambloxus . 
23. Melania Viridis , Raf# Sub- 
oval smooth, five spires, end obtuse, 
opening oblong. Fine shell, one 
inch, green, from Licking River. 
VI. LAND UNI VALVE SHELLS, 
24. APLODON, Rafi 1819. Dif- 
fer from Helix by an ombilic and a 
callous tooth above it in the opening. 
Several sp. 1. A. nodosum, Raf. 
1818, Subdepressed, rugose below 
concentrically, 3- nodose spires. In 
Kentucky, 
25. STENOSTOMA, Raf. 1819. 
Differ from Helix, opening linear 
with lips, upper lip notched, lower 
earinated. 1* St, convexa , Raf. 
Nearly round, both sides convex, 
smooth, 5 spires. Kentucky. 
26. TOXOSTOMA, Raf. 1819. 
Differ from the last, by no lower lip 
nor keel to the opening, which is 
curved. 1. T. globularis, Globu- 
lar smooth, 5 spires. In Kentucky. 
27. MESODON, Raf. 1819. 
Differ from Helix by lower lip with 
a tooth. 1. M, maculatum. De- 
pressed, hardly striated, upper lip 
reflexed, tooth care ni form, 5 spires. 
Fulvous with brown spots. The 
G. Traphodon differ from this by up- 
per lip notched. The G. Odom- 
phium by having an ombilic. 
£B. OMPHALINA, Raf. 1819. 
Differ from Helix by no lips, but an 
ombilic. Many sp. 1. O, cuprecu 
Suboval, 4 spires, smooth, brittle, 
diaphanous coppery, shining, open- 
ing very large. In Kentucky. 
29. TRIO DOFS IS, Raf. 1819. 
Differ Helix, opening with 3 teeth, 
£ above, 1 below, an ombilic. 1. Tr. 
lunula. Depressed, mouth narrow 
with thick lips, ombilic lunuiated# 
In Kentucky. Forma S. G. me* 
nomphis. 
30. XOLOTREMA, Raf. 1819. 
Differ from the last by no ombilic, 
opening linear. 1. X, clausa. Sub- 
depressed, 5 spires a little striated, 
ope ni n g almost hi d d en. 1 have m a- 
ny more landand fluviatile univalves, 
too many to enumerate here; but 
I add two beautiful Agatinas from 
the south. 
31. Agutina Variegaia, Raf. 
1 1820. Six spires, smooth, yellow- 
ish, variegated with brown spots near 
the sutures; first spire with some 
narrow coloured strias concentric. 
Nearly two inches, from Louisiana. 
32. Agatina Fuse at a, Raf. 
1822. Eight spired smooth, reddish 
brown, with broad longitudinal black 
bands on the spires, of a lanceolate 
flexuose shape. Over two inches, 
from Texas. Both collected by 
Dr. Strong. 
VII. FOSSIL BIVALVE SHELLS. 
33. Mytilus exotilus t Raf. 1820# 
Oblong oboval, minutely striated, 
strias broader below, curved near 
the sides. Breadth two thirds of 
length, thickness 4-9. From the 
limestone near Boon creek, Ken- 
tucky, petrified, over 2 inches. 
54. APLEUROTIS, Raf. 1819, 
and tract of October, 1831. N. G. 
very near mytilus , but winged and 
perforated. 1 . ' ApL pecienoides, 
Raf. Oboval, upper valve convex 
striated, wing well marked, lower 
valve fiat, scarcely striated. Breadth 
4-5 of the length, which is over 2 
inches. 2. ApL pusilla , Raf. Ob- 
lique oboval, flattened, minutely 
striated, wing small. Breadth J of 
the length, which is less than one 
inch. Both from Knobhills of Ken- 
tucky. 
36. OXISMA, Raf. 1819. N.G. 
near Pinna . Base truncate, end 
