Gasteropoda and LamellihrancJiiata. 45 



GALLERY YIII. 



' II-Y. SCAPHOPODA, AmPHINEUEA, GASTEROPODA, AND 



Lamellibranchiata. 

 The fossil shells belonging to these groups of Mollusca occupy GALLERY 



the whole of the west, or left-hand side, of this Gallery. The ^^^PJ- 



, West Side, 



foreign specimens are arranged upon the sloping shelves of the --, „ 



"Wall-cases 1-9, and the British Mollusca occupy the Table- 1-9, Table- 

 cases 89-104. The Gasteropods, or Univalves, are placed first in JJ|®^ ^^^ 

 each case,^ then follow the Lamellibranchs (or Pelecypods) ; the 

 whole series being subordinately arranged in stratigraphical order, 

 commencing with the most recent deposits, such as raised beaches, 

 glacial beds, etc., and going back in time to the Silurian and Cam- 

 brian formations. Those British and foreign specimens which are 

 too large to be placed in either of the tableted series, are mounted 

 on blocks and arranged upon tlie higher shelves at the back of 

 the wall-cases according to their stratigraphical division. All 

 figured and described specimens are indicated by a small green disc. 



The British Post -Pliocene non- marine mollusca are grouped Table - 

 according to localities and occupy a separate, narrow, upright, ^'^^^ 

 glazed case in the centre of the Gallery, near Table-case 104. 

 These are succeeded by the Pliocene shells of the " ]N^orwich," Table- 

 the ''Red," and the ''Coralline" Crags; under the latter are jq2 j^ io3. 

 arranged the species from St. Erth, Cornwall. Some fine examples 

 of Valuta Lamberti (Fig. 92) are placed in Table-case 102. One of 

 these measures 9^ inches in length ( = 240 mm.); they are from 

 the Coralline Crag of Gomer, Suffolk. In the half of this case 

 are placed the Oligocene Mollusca from the Isle of Wight and 

 Hampshire. Noticeable among these is the Amphidromus {Bulimus) 

 ellipticiis, Sby., from Headon Hill (Pig. 93). 



Table-cases 100 and 101 contain the Upper, Middle, and Lower Table- 

 Eocene shells from the London and Hampshire basins ; these ^^^^ ^^^' 

 include the Barton, Bracklesham, and London Clay series, etc. 

 Many of the specimens have been figured by Mantell, Sowerby, 

 E. E. Edwards, and others : these all bear a small green disc. 



A slab of Headon Limestone (Oligocene) almost entirely composed 

 of the shells of one fresh-water snail, the Limncea longiscata^ is 

 fixed in a glazed frame on the wall between Wall-cases 2 and 3. 



^ The Scaphopoda [Dentalium) and Polyplacophora {Chiton, etc.), being few 

 in number, are not separated in the cases, but are arranged with the Gasteropods. 



