STKATA OE THE HAMPSHIRE liASl^^ 157 



deposits containiug this third fauna with beds of the same age upon 

 the Continent. In the upper part of Hamstead (or " Hempstead ") 

 and Bouldnor Cliffs in the Isle of Wight, the only point at which 

 the beds of this age are clearly dis^Dlayed, about 100 species of 

 marine Mollusca have been obtained. The distinction between this 

 fauna and that of the Barton and Brockenhurst series respectively 

 is shown by the fact that at Hamstead only five Barton and twelve 

 Brockenhurst forms occur. Indeed, as was clearly perceived by 

 Lyell, the nearest analogues to the Hempstead fauna are to be found, 

 not in the Eocene deposits, but in the Miocene. 



The annexed list of Hempstead fossils sufficiently indicates the 

 character of this fauna ; and there cannot be the smallest doubt as 

 to the foreign deposits which must be correlated with the beds con- 

 taining it. In the Paris basin we have the Lower Eontainebleau 

 Sandstone, in Belgium the Upper Tongrian or Kleyn-Spawen beds, 

 in the Mayence basin and Northern Germany the Marine Sands and 

 Septarian Clay, and in Switzerland the Lower Marine Molasse — each 

 of which contains a fauna presenting so many forms in common with 

 the fauna of the Hempstead beds as to leave no room for doubt as 

 to the approximate contemporaneity of aU these deposits. 



Fossils of the Hempstead Series. 



Voluta Rathieri, Heb. (V. Forbesii, Edw.). 



detrita, Edw. MS. 



Aporrhais (Chenopus) Margerini, de Kon.^ var. speciosa, Schloth. 

 Cantharus crebricostatus, Edw. MS. 

 Pisania (Fusus) labiata, Sow. 



tricincta, Edw. MS. 



paryiuscula, Edw. MS. 



Chrysodomus (Fusus) Edwardsii, Mor. 



Cuma (Purpura) inonoplex, Desk. (C. Charlesworthii, Ediv.). 



Natica conulus, Edw. MS. 



hempsteadensis, Edw. MS. 



labeUata, Lam. 



TurboniUa (PyramideUa) subconvexa, Edw. MS. 



micans, Edw. MS. 



spiculoides, Edw. MS. 



pseudospina, Edw. MS. 



scalaris, Edw. MS. 



Cerithium plicatum, Lam. 



, var. ryssum, Edw. MS. 



, var. muticum, Edw. MS. 



, var. lineatum, Edw. MS. 



, var. immeritum, Edw. MS. 



, var. Galeotti, Nyst. 



, var. intermedium, Sandb. 



, var. papillatum, Sandb. 



suhcostellatum, Forbes. 



inornatum, Mor. (C. acutum, Sow. ?). 



Lamarckii, Brong. (C. Sedgwickii, Mor.). 



elegans, Besh. 



, var. Austenii, Forbes. 



margaritaceum, Sow. 



submargaritaeeum, A. Braiin. 



conoidale, Lain. 



venuBtum, Edw, MS. 



