PLATE (). 



Fig-. 1 a, ft. 47. ]. SCALITES ANGULATUS. (Pag. 27.) 



Fig. 2. 48. 1. Rapiustoma striata. ( Pag. 28.) 



2 a. An obliquely lateral view of the si)ecimeii. showing the spire, with the 3lri;i' upon the surface of the shell. 

 •2 b. View of the spire denuded of the shell. 



Fig. 3. 50. 3. Rapiustoma planistria. ( Pag. 30.) 



3 a. View of the spire ; the stria; Hat and broad. The ligure does not show the interruption. 

 3 b. View from beneath, showing the umbilicus. The height of tlie shell is not shown liere. ( See the figures 

 at the foot of page 3U.) 



Fig. 3. 51. 4. Raphistoma planistria, «ar. parva. (Pag. 30.) 



3 c. View of the spire. 3 d. Lateral view. 3 e. View of the aperture. 



Fig. 4, 5. 49. 2. Raphistoma staminea. (Pag. 29.) 



5. View of the spire; the inner volutions partially denuded of the shell. 



5 a. A lateral view, showing the aperture, which is distorted by crushing from above. The denuded spire is 



shown to rise considerably above the outer volution. The striae upon the side do not bend forward as 



much as in the original. 



Fig. 6. 52. 2. Pleukotomaria biangulata. (Pag. 31.) 



Fig. 7. 56. 1. MuRcnisoNiA abbreviata. (Pag- 32.) 



Fig. 8. 53. 3. PhEVROTomxiLiA. (Species U7idetermi/u!d). (Pag. 31.) 



Fig. 9 a, A. 55. 1. Capulus auriformis. (Pag. 31.) 



Fig. 10. 57. 1. Bucania sulcatina. (Pag. 32.) 



10. Dorsal view, looking into the aperture, which is filled with stony matter, so that the form can not well be 

 shown. The shell is denuded from a large portion of the last volution, but is well preserved on the part 

 exhibited in the figure. 



10 a. Lateral view of the fossil denuded of the shell ; the cast smooth. 



Fig. 11. 58. 2. Bucania rotdndata. (Pag- 33-) 



11 a. Dorsal view, looking into the aperture, which is partially filled with stony matter, and broken at the sides. 



In this view, it presents the aspect of a Btllerophon. 

 11 ft. Side view ; the volutions not all visible, from the umbilicus being filled with stony matter. 

 He. Longitudinal section, showing the form and relation of the volutions to each other ; the dotted line is the 



margin of tlie outer volution near the aperture. 



