TAB. XXII. 



Fig. 



1. Tellina Baltliica, p. 231. 



a, h, specimen from Clacton, found in clay, with Unio littoralis. 

 c, specimen from Mam. Crag of Norfolk. 



2. Psammobia vespertina, p. 222. 



a, b, representation of a monster valve from Sudbournc. 

 f, d, specimen from Ramsholt. 



3. Psammobia Fcrroensis, p. 221. From Coralline Crag, Sutton. 



4. Psammobia Tellinella, p. 223. „ 



5. Tellina donacina, p. 233. „ 



6. Tellina donacilla, p. 234. „ „ 



7. Donax \-ittatus, p. 219- From Mam. Crag, Bramcrton. 



8. Donax trunculus, p. 219. From Red Crag, Sutton. 



9. Donax politus, p. 220. From Coralline Crag, Sutton. 



10. Abra alba, p. 237. „ „ 



c, enlarged hinge of right valve. 



1 1 . Abra obovalis, p. 240. 



c, enlarged hinge of right valve. 



12. Abra ftibalis, p. 238. From Red Crag, Walton Naze. 



13. Abra prismatica, p. 239. From Coralline Crag, Sutton. 



14. Trigonella plana, p. 235. 



a, c, show difference of form in pallcal impression. 



