532 Mr. S. V. Wood^s Catalogue of Shells from the Crag. 



Cor. Crag. Red Crag. Mam, Crag. Recent. 



10. Trochus tumidus, Mont. (Test. Brit. p. 280. t. 10. f. 4. Troclius 



nitens ? Woodward, Geol. of Nor f. t. 3. f. 10). 



Sutton, j Sutton. | ] Britain. 



11. — littoralis. Brown {Illust. Brit. Conch, pi. 45. f. 1, 4). 



I Sutton. I I Britain. 



12. — obconicus, n. s. 



Sutton. I t I 



13. — bicariniferus, n. s. 



Sutton. It t 



14. — tricariniferus, n. s. 



Sutton. I I I 



1. Vermetus intortus, Bronn (Lethcea Geognostica, taf. 36. f. 18). 



Sutton. I Sutton. | | 



1. Valvata piscinalis, Gray {Edit. ofTurt. Man. pi. 10. f. 114). 

 I I Bulcham. | Britain. 



Captain Alexander's cabinet. 

 1. Paludina unicolor, Swainson (Zool. Illust. pi. 98. Paludina media. 

 Woodward, Geol. of Norf. t. 3. f. 5, 6. Paludina rotundata, 

 id. t. 3. f. 7. Paludina lenta, Min. Con. t. 31. f. 3). 

 I I Bramerton. | Bengal. 



l.Bithynia tentaculata. Gray {Edit, of Turt. Man. pi. 10. f. 120. 

 Paludina impura, Lamarck, vi. p. 175). 



I I Bulcham. | Britain. 



Captain Alexander's cabinet. 



1. Littorina littoreus (Turbo littoreus, Min. Con. t. 71. f. 1. Turbo 



rudis, id. t. 71. f. 2. Turbo carinatus, Woodward, Geol. of 

 Norf t. 3. f. 11. Turbo ventricosus, id. t. 3. f. 12. Turbo 

 bicarinatus, id. t. 3. f. 13. Turbo sulcatus, id. t. 3. f. 14, 15. 

 Delphinula carinatus, id. t. 3. f. 9. Littorina squalida, Zool. of 

 Beechey's Voy. pi. 34. f. 12). 



I Sutton. I Bramerton. | Britain. 

 I have considered the above as referrible to one species, as they 

 can be connected by every shade of difference. The cause of these 

 deformities may perhaps have been a more than ordinary alteration 

 of the water, both in respect to its density and temperature, in the 

 estuary which these shells in all probability inhabited. Specimens 

 occasionally found in the red crag preserve a uniformity of shape 

 similar to those with which our markets are supplied. 



2. — elongata (Turbo elongatus, Woodward, Geol. of Norf. t. 3. 



f. 16-18). 



I I Bramerton. | 



I have never seen this shell. 



3. — ? suboperta (Vivipara suboperta, Min. Con. t. 31. f. 1). 



I Sutton. I I 



4. — } phasianelloides, n. s. 



I Sutton. I I 



