Fig. 
TAB. XXII. 
1. Tellina Balthica, p. 231. 
a, 6, specimen from Clacton, found in clay, with Unio littoralis. 
c, specimen from Mam. Crag of Norfolk. 
. Psammobia vespertina, p. 222. 
a, 6, representation of a monster valve from Sudbourne. 
c, d, specimen from Ramsholt. 
- Psammobia Ferréensis, p. 221. From Coralline Crag, Sutton. 
. Psammobia Tellinella, p. 223. 
. Tellina donacina, p. 233. 
. Tellina donacilla, p. 234. 
. Donax vittatus, p. 219. From Mam. Crag, Bramerton. 
. Donax trunculus, p. 219. From Red Crag, Sutton. 
. Donax politus, p. 220. From Coralline Crag, Sutton. 
. Abra alba, p. 237. 
32 22 
23 39 
c, enlarged hinge of right valve. 
. Abra obovalis, p. 240. 
c, enlarged hinge of right valve. 
. Abra fabalis, p. 238. From Red Crag, Walton Naze. 
. Abra prismatica, p. 239. From Coralline Crag, Sutton. 
. Trigonella plana, p. 235. 
a, c, Show difference of form in palleal impression. 
