368 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 26, 



Panopsea intermedia, Sow. Soweriii ; same as occurs at South- 



Pectunculus brevirostris, Sow. ampton and Cuffell). 



Pinna affinis, Sow. Rostellaria lucida, Sov). 



Pholadoraya margaritacea, Sow. Tun'itella imbricataria, Lam. 



Pleurotoma (same species as at Newn- Teredo antenauta, Sow. 



ham). Venericardia Suessonensis, d'JrcMac. 



Psammobia compressa ?, Sow. Flustra. 



Pyrula tricostata, Desk. Desmophyllum (same species as at 



Smithii, Sow. Highgate). 



Rostellaria (small species resembling the 



The small undescribed jRo5^eZ/«r2«, ihtNatica glaucinoides, Pano- 

 'pcea intermedia, Pinna affinis, Pectunculus hrevirostris and Veneri- 

 cardia Suessonensis here occur in the greatest abundance. The 

 PanopcBa is beautifully exhibited in its normal position, as when 

 living and boring downwards into the soft mud : its shell is pre- 

 served, but in a very friable state, as it also is at Southampton and in 

 the Isle of Wight. The shells of the Pinna and Pholadoraya are like- 

 wise very tender, and difficult to be obtained entire ; they still how- 

 ever retain some of their lustre. The other shells are in a tolerably 

 good state of preservation, especially the Natica, which usually ex- 

 hibits a bright untarnished surface. 



The thin conglomerate masses of rock before-mentioned as here 

 occurring at the base of these clays are full of Corbula, Cyprina Mor- 

 risiiy Ditrupa plana, Natica Hantoniensis, Nucula, Fusus tuherosus, 

 Pectunculus hrevirostris, Cytherea ohliqua 2.vl^ Pleurotoma. (Point ^ 

 in fig. 6. Comp. Sect. Plate XIV.) 



On comparing the foregoing lists of fossils, we find that of the 37 

 known species which form a very typical and distinctive group in 

 these beds in the Isle of Wight, 25 occur again among the 32 found 

 at Southampton ; and of the 23 species from Clarendon, 20 are of 

 forms common at Southampton and the Isle of Wight. 



We are warranted therefore, both by structure and organic remains, 

 in regarding these strata of this portion of the Hampshire tertiaries 

 as synchronous. It is also evident that they possess a peculiar and 

 distinct farnia, since, out of the 49 species which they contain, only 

 1 8 range upwards into the Bracklesham and Barton beds * . 



If we now pass over to that portion of the London district nearest 

 to the Hampshire tertiary district, we shall find a fauna perfectly ana- 



* The limited supplies of specimens furnished by the well at Southampton, and 

 the short examination hitherto made of these beds in the Isle of Wight, renders 

 our knowledge of their fauna no doubt defective, and restricted probably to the 

 most abundant species. A careful search in these beds at Alum Bay would doubt- 

 less produce a considerable addition to the number of organic remains now 

 known : but even from our present knowledge of them it is apparent that they 

 are, wherever exhibited in Hampshire, characterized by a peculiar group of fossils. 

 In addition to the species enumerated in the foregoing lists, there are a few 

 others which occur at Bognor, and which, as we shall have to take them into 

 account in our comparison of the Hampshire Vidth the London series, are given 

 below : 



Conus. Pseudoliva semicostata, Desk. 



Modiola elegans. Sow. Thracia oblata, Sow. 



Nautilus Sowerbii, Soto. Venericardia Brongniarti, Mant. 



Pholadomya Dixoni, Sow, Xiphidion quadratum, Sov\ 



