50 Guide to the Invertehrata. 



GALIEBT Key to the Table-cases containing the collection of fossil shells 

 of British Gasteropoda and Zamellihranchiata, including those 

 table-cases arranged in the centre of Gallery. 



Table -case. 



104a. British Post-Tertiary Land and Fresh-water Mollusca. 



104. Post-Tertiary (Marine), Pliocene (Norwich Crag). 



103a. Pliocene (Norwich, Red, and Coralline Crags). 



103. Pliocene (Norwich, Red, and Coralline Crags). 



102. Pliocene (Coralline Crag), Oligocene (Hempstead to 



Headon Beds). 



101. Eocene (Upper and Middle). 



100. Eocene (Lower). 



99. Chalk. 



98. Upper Green sand and Gault. 



97. Aptian (Lower Greensand), Urgonian, and Neocomian. 



96. Wealden (Neocomian), Purbeck, and Portland Beds. 



95. Kimeridge Clay and Coralline Oolite. 



94. Oxford Clay, Kellaway's Rock, Cornbrash, Eorest 

 Marble, Bradford Clay, and Great Oolite. 



93. Great Oolite, Fuller's Earth, and Inferior Oolite. 



92. Inferior Oolite. 



91. Lias, Trias, and Permian. 



90. Carboniferous and Devonian. 



89a. Foreign Palaeozoic MoUusca. 



89. Silurian, Ordovician, and Cambrian. 



Foreign Mollusca. — The Foreign Quaternary and Tertiary 

 Wall-cases groups of Mollusca commence in Wall-case 1 with shells from 

 raised beaches like those of Florida and Australia, and with 

 Italian Pliocene shells. Then follow Miocene Mollusca from 

 Bordeaux, from Muddy Creek, Victoria, and from South Australia 

 (Wall-cases 2 and 3) ; next is the magnificent series of Eocene 

 Mollusca from Paris, Grignon, and Epernay. 



The shells of the Paris Basin exhibit strong affinity with those 

 of the English Eocene ; but the former are often more perfectly 

 preserved and the species more abundant than in the latter deposits. 

 Fine specimens of Campanile ( Cerithium) giganteum (Fig. 94) from 

 Grignon are placed in a glass case between Wall-cases 3 and 4, and 

 others are mounted in the wall-case, together with a longitudinal 

 section showing the shelly plaits upon the columella. In a glass 

 case, between Wall -cases 2 and 3, is exhibited the shell of 



