Bigs te 
la, 
Ll ie; 
1; 
if. 
ieee 
1h: 
ies 
1k. 
Fig. 2. 
2a. 
Fig. 3. 
3 a. 
3b. 
Fig. 4. 
4a. 
Fig. 5. 
Pa 
2a. 
Fig. 6. 
6a. 
6¢. 
6 d. 
PLATE 34. 
189. 1. Nucuta LEvATA. (Pag. 150.) 
b. Left valve and posterior view of a specimen of the prevailing form in New-York. The muscular im- 
pressions + + are distinctly visible. 
d. Similar views of a large shell, slightly varying in its proportions. 
Left valve of a very gibbous specimen, in which the posterior side is less extended. 
A specimen less elevated, and approaching the western forms. 
Cast of a western specimen, showing more distinctly the muscular impressions + f. 
Cardinal view of the same, showing the crenulations of the hinge, and the same enlarged. 
A small specimen of the same, with the shell showing faint concentric lines. 
Cardinal view of a gibbous specimen. 
190. 2. NucvuLa PosTSTRIATA. (Pag. 151.) 
Right valve of this species. 2b. Cardinal view of the same specimen. 
191. 1. TrLtinomya NasuTa. (Pag. 162.) 
Right valve of a specimen on which the shell is preserved. 
Similar view of a cast, showing the muscular impression a. 3c. Dorsal view of the same. 
192. 2. TELLINOMYA SANGUINOLAROIDEA. (Pag. 152.) 
Right valve, showing the posterior muscular impression a. 4 b. Cardinal view of the same specimen. 
193. 3. TELLINOMYA GIBBOSA. (Pag. 153.) 
Right valve of this species. 5 b. Dorsal valve. 
194, 4. ‘TELLINOMYA DUBIA. (Pag. 153.) 
Cardinal view of the two valves in connection. 6 6. Left valve of the same, slightly contracted behind. 
A separate valve, in which the posterior contraction is scarcely perceptible. 
Left valve of a specimen, in which the posterior side is much contracted. 
6 e, f. Separate valve of an old shell, with a view of the dorsal margin. 
Fig. 7. 
Fig. 8. 
Fig. 9. 
Fig. 10. 
195. 5, TELLINOMYA ANATINIFORMIS. (Pag. 154.) 
196. 1. CarpiomorPHA VETUSTA. (Pag. 154.) 
198. 2. EDMONDIA sSUBTRUNCATA. (Pag. 156.) 
209. 10. Mopiotopsis? TRENTONENSIS. (Pag. 161.) 
