20 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 6, 



Lima proboscidea, Sow. 



Etheridgii, Wr. 



duplicata, Sow. 



Trichites undulatus, Lye. 

 Astarte excavata, Sow. 

 Cyprina (a mould). 

 Cypricardia cordiformis, Desk, 

 Myacites calceiformis, Sow. 

 Gervillia consobrina, oV Orb. 

 Mytilus explanatus, Mor. 



Pboladomya Heraulti, Ag. 

 Homomya crassiuscula, Lye. 

 Myoconcba crassa, Sow. 

 Pteroperna plana, Lye. 

 Trigonia eostata, Sow. 



striata, Sow. 



decorata, Ag. 



Modiola imbricata, Sow. 

 Pinna fissa, Phil. 



Ehynchonella subtetrahedra, Davids. 



~No. 3. The Oyster-bed consists of a coarse, brown, ferruginous,, 

 sandy marl, with inconstant layers of ragstone. The fossils lie 

 chiefly in the sand. The bed is about one yard in thickness, and 

 contains — 



Ostrea flabelloides, Lamh. (and three 



other varieties of this Oyster). 

 Ostrea pyxiformis, Wr., sp. nov. 

 Pecten demissus, Golclf. 

 Lima proboscidea, Sow. 



Etheridgii, Wr. 



Monotis tenuicostata, Wr., sp. n. 

 Grresslya abducta, Phil. 

 Pleuromya tenuistriata, Ag. 



Pholadomya Heraulti, Ag. 



OTulum, Ag. 



media, Ag. 



Levalquei, Lye. 



Serpula grandis, Goldf. 

 limax, Goldf. 



Clypeus Michelini, Wr. 

 Stomechinus germinans, Phil. 

 Pseudodiadema depressum, Ag. 



No. 4. The Marl-bed. — Beneath a thin band of clay which 

 underlies the oyster-bed, and forms the floor of the quarry, a bed 

 of soft mudstone is exposed at one or two points. It contains many 

 fossils, with their shells ; but the tests were in such a rotten state, 

 that few species could be determined. Prom the position of the 

 bed and its organic contents, it appears to be the upper portion of 

 the oolite-marl, as this rock is in position and well developed within 

 200 yards of the " rolling-bank." I noted the following species in 

 the portions which I examined : — 



Chemnitzia, sp. 

 Nerinaea, sp. 

 Modiola plicata, Sow. 

 Pecten lens, Sow. 



Cypricardia cordiformis, Desh. 

 Terebratula Etheridgii, Davids. 

 Montlivaltia, sp. 



B. Dundry Hill. — Dundry Hill has been long known to collectors 

 as a rich locality for fossils ; but the true relations of its beds of Infe- 

 rior Oolite with those of other regions have not until now been 

 accurately described. Having studied the interesting sections of 

 this locality in former years, in conjunction with my friend Mr. 

 Etheridge, and knowing how carefully he had examined the several 

 beds at Dundry for the purpose of determining the true horizon of 

 the different species of fossils from this locality, which are contained 

 in the fine Dundry collection in the Bristol Institution, I asked my 

 friend to contribute to this memoir his notes and sections. And this 

 he has most kindly done, adding thereto a full list of the species con- 

 tained in the different beds. This important communication will be 

 found to form one of the most valuable portions of this memoir ; and 

 for it I beg to return my best thanks. 



