PLATE 10. 
Fig. 1. 66. 1. MopioLa optusa. (Pag. 40.) 
Fig. 2 a, b. 67. 2. MurcHIsoniA? ANGUSTATA. (Pag. 41.) 
Fig. 3. 68. 3. MurcHIsonia VENTRICOSA. (Pag. 41.) 
Fig. 4. 69. 4. MurcHIsoNIA PERANGULATA. (Pag. 41.) 
Fig. 5. 71. 1. Nartica? (Specées undetermined ). (Pag. 42.) 
Fig. 6. 72. 5. PLevRoToMARIA? NUCLEOLATA. (Pag. 42.) 
6 a. Natural size of specimen. 6 b. Enlarged view of the same. 
Fig. 7. 70. 5. Murcuisonia? vaRicosa. (Pag. 42.) 
7 a. A specimen having the surface much worn and weathered : the markings are but partially visible. 
7b. Longitudinal section of a specimen of the same shell. 
Fig. 8. 73. 6. PLEUROTOMARIA QUADRICARINATA. (Pag. 43.) 
Fig. 9. 74, 7. PLEUROTOMARIA UMBILICATA. (Pag. 43.) 
9 a. Lateral view of a cast of this species, the spire partially obliterated. 
9 b. View of a larger specimen, showing but a single angle upon the cast, the upper one having been oblite- 
rated. 
9 c. View of the upper side of a smaller specimen. 
9 d. Lateral view of a specimen much compressed. 9 e. Lower surface of the same, showing the 
umbilicus and the strie upon the shell, which is partially preserved. 
9 g. View of the upper side of a crushed specimen. 9h. Lower side of a small specimen. 
Fig. 10. 75. 8. PLEUROTOMARIA? NODULOSA. (Pag. 44.) 
Fig. 11. 76. 9. PLEUROTOMARIA? OBSOLETA. (Pag. 44.) 
Fig. 12. 77. 1. Cyruerina (Species undetermined ). (Pag. 44.) 
