CHAPTER IV. 



PART VI. 

 FOSSIL SHELLS AND COEALS. 



TERTIARY AND OOLITIC GASTEROPODOTJS SHELLS UNIVALVES PROM MINCHIN- 



HAMPTON SHELLS IN SEPTARIUM SHELLS PROM GRIGNON, HORDWELL, 



AND THE CRAG CORALS AND OTHER ZOOPHYTES NUMMULITES OP EGYPT, 



FOSSIL SHELLS. Table-cases 15 and 18. The fossil shells 

 deposited in these Table-cases are arranged zoologically ; that 

 is, as gasteropodous mollusca, without reference to their 

 geological relations : thus the remains of extinct species and 

 genera of molluscous animals that inhabited the seas of the 

 oolitic period, and were contemporaries of the marine reptiles, 

 the Ichthyosauri and Plesiosauri, which engaged our attention 

 in the earlier pages of this chapter, are placed with the uni- 

 valves that sported in the seas of the comparatively recent 

 periods of the London Eocene, and the Crag. 



The shells in Case 15, are chiefly from tertiary deposits; 

 there is a fine suite from Hordwell, 1 and from Grignon. The 

 fossils from the Great Oolite of Minchinhampton are particu- 

 larly deserving attention, not only on account of the recently 

 discovered species from that formation, but also for their 

 remarkably perfect state ; for they have been extracted from 

 the rock with great skill. 



SEPTARIUM WITH SHELLS. Table-case 15. In this Case 

 there is a group of shells which affords an instructive illus- 

 tration of the different aspects in which the same species may 

 occur in a fossil state. The specimens to which I allude are 



11 See my "Geology of the Isle of Wight/' p. 171. 



