PLATE 10. 
Fig. 1. 
66. 1. 
Modiola obtusa. 
(Pag. 40.) 
Fig. 2 a, b. 67. 2. 
Murchisonia? angustata. 
(Pag. 41.) 
Fig. 3. 
68. 3. 
MuRCHISONIA VENTR1COSA. 
(Pag. 41.) 
Fig. 4. 
69. 4. 
Murchisonia perangulata. 
(Pag. 41.) 
Fig. 5. 
71. 1. 
N atica ? ( Species undetermined). 
(Pag. 42.) 
Fig. 6. 
72. 5. 
Pleurotomaria? nucleolata. 
(Pag. 42.) 
6 a. Natural size of specimen 
6 b. Enlarged view of 1 
the same. 
Fig. 7. 
70. 5. 
Murchisonia? varicosa. 
(Pag. 42.) 
7 a. 
A specimen having the surface much worn and weathered : the markings 
are but partially visible. 
7 b. 
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 striae upon the shell, which is partially preserved. 
9 g. View of the upper side of a crushed specimen. 9 h. 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 . 
Cytherina ( Species undetermined). 
(Pag. 44.) 
