MOLLUSCA (except CEPHALOPODA). 
133 
Charmouth, and of Okeford Fitzpaine also in Horset, all 
which are on the other side of the Case. Among the 
Gastropods the Aporrhaidte with their winged lips and the 
Scalariida3 with their transverse ribs furnisli the most 
striking forms. Among Lamellibranchs one may notice 
species of Actinoceraimis (Fig. 71 b), Trigonia, Cumllsea, 
Liopistha \^Tkctis\ Thracia, Pinna, Perna, and Protocardia. 
During the Aptian age was deposited the Lower Green- 
sand of Hythe, Sandgate, and Faringdon. Here are casts 
of the borings made by Lithodomus and Pholas. Plcuroto- 
maria gigantea, Alcctrgonia macrojitcra, and Toucasia Lons- 
dalci are noteworthy forms. The last is a representative of 
the Diceratidae (see p. 143). 
The Barremian or Urgonian age is represented in tlie 
South of England by the marine Atherfield Clay of the Isle 
of Wight and the brackish-water Punfield Beds of Dorset, 
both of which belong to its lower division. Exogyra 
sinuata was then a common oyster ; among the sliells 
exhibited one has been cut througli to show its great 
thickness in old age. The long-hinged Perna Mullcti occurs 
in quantities in a special layer at Atherfield. Here are also 
shown the elongate Gervillia anceps, with species of Trigonia, 
Spliacra, Protocardia, Gyprina, and Astarte, and, among the 
Gastropods, Ccratosiphon \Aporrhais\ Fittoni, and Vican/a 
Pizcuetana. 
Next come fossils from various rocks in the east of 
England : the Speeton Clay of Yorkshire, tlie Tealby 
Series, and Claxby Ironstone, of Lincolnshire, all which 
correspond partly to the Barremian and partly to the preced- 
ing Neocomian Age. Among the more interesting lamel- 
libranchs are Exogyra subsinuata (= E. Couloni), Tngonia 
ingens, and the large Cainj)toneclcs \^l^ectai\ dnctus from 
the Claxby Ironstone and Cucullaea donningioncnsis. The 
Lincolnshire formations run over into the next Case, and 
are followed by fossils from the Wealden of Sussex and the 
Isle of Wight. The name Wealden is applied to a series 
of freshwater and estuarine formations depo.sited mainly 
during the Neocomian Age, and perhaps beginning at the 
end of the Jurassic Epoch. Among river-shells are examples 
of Unio, including the type-specimen of the lax'ge U. valdcnsis 
from Sussex and the Isle of Wight, also the oldest Anodonta 
known — A. Becklesi from the Hastings beds. In the middle 
ot the Gallery is a polished slab of Betworth or Sussex Marble, 
composed ot the shells of a freshwater snail, Vwiparus 
Gallery 
VIII. 
Table-case 
8 . 
Table-ease 
8 . 
Table-case 
8 . 
Table-case 
9 . 
