PLATE 33*. 
Fig. 1. 175. 8. Atrypa cuspidata. (Pag. 138.) 
1 a. 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 f. 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, b. 
377. 
8. 
Ambonychia mytiloides. 
(Pag. 315.) 
Fig. 3. 
379. 
3. 
Nuctjla? donaciformis. 
(Pag. 316.) 
3 a. Right valve of this species 
3 b. Cardinal view of the same. 
Fig. 4. 
380. 
6. 
Bucania intexta. 
(Pag. 317.) 
4 a. Dorsal view of the fragment. 4 b. Lateral view. 4 c. A portion of the surface magnified. 
4 d. A portion of the surface of B. sulcatina magnified. 
Fig. 5. 354. 14. Modiolopsis terminalis. (Pag* 318.) 
5 a. Left valve of the fragment. 
5 b. Dorsal view of the same. 
