PLATE 33%. 
Fig. 1. 175. 8. ATRYPA CUSPIDATA. (Pag. 138.) 
1 a. Ventral valve of a perfect specimen. 1 b. Front view. 1c. 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. 
1f. Profile view of the same. 
1 g. Dorsal valve of a specimen which is more extended laterally. 1A. Front view of the same. 
Fig. 2 a, b. 377. 8. AMBONYCHIA MYTILOIDES. (Pag. 315.) 
Fig. 3. 379. 3. NucuLa? DONACIFORMIS. (Pag. 316.) 
3 a. Right valve of this species. 3 6. Cardinal view of the same. 
Fig. 4. 380. 6. Bucania INTEXTA. (Pag. 317.) 
4 a. Dorsal view of the fragment. 4 6. Lateral view. 4c. A portion of the surface magnified. 
4d. A portion of the surface of B. sulcatina magnified. 
Fig. 5. 354. 14. MopioLopsis TERMINALIS. (Pag. 318.) 
5 a. Left valve of the fragment. 5 b. Dorsal view of the same. 
