Mr. S. V. Wood's Catalogue of Shells from the Crag. 533 



Cor. Cray. Red Crag. Mam. Crag. Recent. 



1. Turbo ? sphseroidea, n. s. 



Sutton. | | 



Spec. Char. Spheroidal; whorls three, rapidly enlarging, convex; 

 suture deep, spirally striated ; peritreme sharp ; outer lip curved ; um- 

 bilicus surrounded by a prominent keel ; shell nacreous. Axis one- 

 twentieth of an inch. PL V. f. 3. 



The exterior is covered with six or seven raised striae or ridges un- 

 equally distributed, being nearer together at the lower part of the 

 volution, where one is elevated into a sort of keel that surrounds the 

 umbilicus, within which it is naked. The figure appears rather too 

 elongated. 



1. Rissoa Zetlandica (Cyclostrema Zetlandica, Flem. Brit. An. p. 312. 



Turbo Zetlandica, Mont. Linn. Trans, xi. t. 13. f. 3). 

 Sutton. | | | Zetland. 



2. — reticulata (Turbo reticulata, Mont. Test. Brit. p. 322. t. 21. f. 1. 



Cingula reticulata, Flem. Brit. An. p. 306). 



Sutton. | | | Britain. 



3. — semicostata (Turbo semicostatus, Mont. Test. Brit. p. 326. 



t. 25. f. 5. Turbo semicostatus, Woodward, Geol. of Nor f. 

 t. 3. f. 19. Cingula semicostata, Flem. Brit. An. p. 307). 

 | Sutton. | Bramerton. | Britain. 



4. — subumbilicata (Turbo subumbilicatus, Mont. Test. Brit.ip. 316. 



Turbo minutus, Woodward, Geol. of Norf. t. 3. f. 20). 



| Bramerton. | Britain. 

 Axis three -sixteenths of an inch. 



5. 



supracostata, n. s. 





Sutton. | 



6.— 



crassistriata, n. s. 





Sutton. | 



7.— 



obsoleta,. n. s. 





Sutton. | 



8.— 



confinis, n. s. 





Sutton. | 



9.— 



concinna, n. s. 





Sutton. 



10.- 



- ? costellata, n. s. 





Sutton. | 



11.- 



- ? angusta, n. s. 





Sutton. 



The above small shells are occasionally much eroded, and their ex- 

 terior markings sometimes obliterated ; this is often the case with 

 recent shells found in sand, where attrition, produced by the move- 

 ment of the waves, has removed the striae and other distinguishing 

 characters ; there is in consequence a doubt of the correctness of 

 these identifications. 



