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PLATE 33*.  . .*« 



Fig. 1. 175. 8. Atkypa cuspidata. (P^g- 138') 



1 o. Ventral valve of a perfect specimen. 1 b. Front view. 1 c. Dorsal valve. 1 d. Profile view. 

 1 e. Front view of a specimen, where the sinus is narrower and more angular than in the preceding. 

 1 /. Profile view of the same. ' 



1 g. Dorsal valve of a specimen which is more extended laterally. 1 h. Front view of the same. 



Fig. 2 a, i. 377. 8. Ambonychia mytiloides. (Pag. 315.) 



Fig. 3. 379. 3. Nucula? donacifoemis. (Pag. 316.) 



3 a. Right valve of this species. 3 b. Cardinal view of the same. MiC 



Fig. 4. 380. 6. BucANiA iNTEXTA. (Pag. 317.) 



4 o. Dorsal view of the fragment. 4 6. Lateral view. 4 c. A portion of the surface magnified. 



4 d. A portion of the surface of B. tuleatina magnified. 



Fig. 6. 354. 14. Modiolopsis terminalis. C^ag. 318.) 



5 a. Left valve of the fragment 5 b. Dorsal view of the same. 



