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PLATE 34. 



Fig. 1. 189. 1. NucuLA LEVATA.  (Pag. 150.) 



1 a, 4. Left valve and posterior view of a specimen of the prevailing form in New-York. The muscular im- 

 pressions t t are distinctly visible. 

 1 c, d. Similar vievss of a large shell, slightly varying in its proportions. 

 1 e. Left valve of a very gibbous specimen, in which the posterior side is less extended. 

 1 /. A specimen less elevated, and approaching the western forms. 

 1 g. Cast of a western specimen, showing more distinctly the muscular impressions f t- 

 1 h. Cardinal view of the same, showing the crenulations of the hinge, and the same enlarged. 

 1 >. A small specimen of the same, with the shell showing faint concentric lines. 



1 k. Cardinal view of a gibbous specimen. 



Fig. 2. 190. 2. NncuLA poststriata. (Pag. 151.) 



2 a. Right valve of this species. 2 b. Cardinal view of the same specimen. 



Fig. 3. 191. 1. Tellinomya nashta. (Pag- 152.) 



3 a. Right valve of a specimen on which the shell is preserved . 



3 b. Similar view of a cast, showing the muscular impression a. 3 e. Dorsal view of the same. 



Fig. 4. 192. 2. Tellinomya sangoinolakoidea. (Pag. 152.) 



4 a. Right valve, showing the posterior muscular impression a. 4 b. Cardinal view of the same specimen. 



Fig. 6. 193. 3. Tellinomya oibbosa. ( Pag. 153.) 



5 a. Right valve of this species. 5 b. Dorsal valve. 



Fig. 6. 194. 4. Tellinomya dubla. (Pag- 163.) 



6 a. Cardinal view of the two valves in connection. b. Left valve of the game, slightly contracted behind. 

 6 e. A separate valve, in which the posterior contraction is scarcely perceptible. 



6 d. Left valve of a specimen, in which the posterior side is much contracted. 

 6 «,/. Separate valve of an old shell, with a view of the dorsal margin. 



Fig. 7. 195. 5. Tellinomya anatiniformis. (Pag- 154.) 



Fig. 8. 196. 1. Gakdiomorfra TETUSTA. (Pag. 154.) 



Fig. 9. 198. 2. Edmondla subtruncata. (Pag. 166.) 



Fig. 10. 209. 10. MoDioLOPSis? trentonensis. (Pag. 161.) 



