252 
Plate 
u 
(>C 
4 
Middle 
Upper figure. Sigaretus perspectivus. 
Lower “ “ 
“ MACULATUS. 
Yenus grata. 
SCALARIA CLATHRUS, L. 
“ MULTISTRIATA. 
“ LINEATA. 
Middle figure. Amphidesma transversum. 
Exterior “ “ iEQUALE. 
Middle Fusus corners, L. 
Exterior “ cinerers. 
XXX. figure 1. Paludina ponderosa. 
SUBPURPRREA. 
XXVI. 
xxvil 
XXVlll. 
XXIX. 
Upper “ 
Lower right 
Lower left 
u 
3. 
U 
U 
xxxi. to Ixviii. are lettered. 
INTERTEXTA. 
(From Nicholson'S Encj^cl.) 
Plate Ixix. figure 1. 
Helix albolabris. 
44 
2. 
ALTERNATA. 
■»(. 
4 4 
3. 
‘‘ GLAPMYRA. 
4. 4 
4. 
^Planorbis BICARINATUS. 
r. (, 
4.6 
5, 
“ PARVUS. 
i. 4 
44 
6. 
(Lymn^a) Physa heterostropha 
(k 
44 
7. 
Paludina subcarinata. 
&& 
44 
8. 
Unio grasses. 
..4 
44 
9. 
Cyclas similis. 
44 
10. 
“ DUBIA. 
ixx. 
44 
1. 
Helix tridentata. 
U 
U 
2. 
Planorbis trivolvis. 
U 
iC 
3. 
Lymn.^ea catascopium. 
b(. 
44 
4. 
(Paludina) Melania virginica. 
44 
5. 
Paludina vivipara, L. 
44 
U 
6. 
‘‘ DECISA. 
44 
fi 
7. 
Unio ovatus. 
> 4 
U 
8. 
“ OCHRACEUS. 
Ixxi. 
44 
1. 
“ PURPUREUS. 
4 4 
44 
2. 
“ CARIOSUS. 
44 
U 
3. 
Alasmodonta undulata. 
44 
U 
4. 
Anodonta cataracta. 
4 4 
64- 
5. 
“ marginata. 
4 A 
U 
6. 
“ undulata. 
ixxii. 
44 
1. 
Unio nasutus. 
44 
44. 
2. 
“ ALATUS. 
(, (. 
44 
3. 
“ CYLINDRICUS. 
U 
44 
4. 
Helix arboreus. 
i.L 
u 
5. 
Pupa corticaria. 
(From Long’s Exp.) 
Ixxiii., Ixiv. have the names of the figures. 
(From a copper plate prepared by Mr. Say, but never published 
Ixxv. Ampellaria ROTUNDATA, (^es^e 
