TAB. XXX. 



Fig. 



1 . Pholadomya hesterna, p. 266. From Coralline Crag, Ramsholt. 



c, hinge ; d, portion of shell magnified to show the granulated or shagreen 

 surface. 



2. Corbula complanata, p. 275. From Red Crag, Sutton. . 



3. Corbula striata, p. 274. From Coralline Crag, Sutton. 



4. Corbula rosea r p. 275. ,, „ 



5. Poromya granulata, p. 268. ,, „ 



e,f, hinge of both valves magnified, to show the fosse for internal ligament. 



6. Nesera cuspidata, p. 273. A fragment only. The outline is imaginary. From 



Coralline Crag, Sutton. 



7. Nesera jugosa, p. 272. The line denotes the natural size. From Coralline Crag, 



Sutton. 



8. Pholas cylindrica, p. 295. From Red Crag, Walton Naze. 



d, accessory valve, probably of this species. 



9. Pholas crispata, p. 296. From Red Crag, Walton Naze. 



10. Pholadidea papyracea, p. 298. Figured from two fragments connected by an 



outline. From Coralline Crag, Sutton. 



1 1 . Gastrochsena dubia, p. 292. From Coralline Crag, Sutton. 



c, incrassated portion of the neck of its flask-like envelope. 



d, represents the siphonal apertures. 



12. Teredo Norvagica, p. 300. From Coralline Crag, Sutton. 



c, posterior portion of tube, showing camerated partitions. 



d, fragment of a thick tube ; natural size. 



