528 Mr. S. V. Weed's Catalogue of Shells from the Crag. 



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



4. Capulus fallax, n. s. 



I Sutton. I I 



1. Emarginula crassa, Sow. (Min. Con. t. 33). 



Ramsholt. | Sutton. | | 



2. — fissura, Flem. (Brit. An. p. 365. Patella fissura, Li?in. Syst. 

 p. 1261. Emarginula reticulata, Min. Con. t. 33). 



Sutton. I Sutton. | | Britain. 



3. — punctura, n. s. 



Sutton. I I I 



1. Fissurella cancellata (Patella cancellata. Lister, t. 527. f. 2. Fis- 

 surella graeca, Min. Con. t. 483). 



Sutton. I WaltonNaze. | | Britain. 



var. ft. depressa. 



Ramsholt. | | | 



This is larger than the generality of recent British specimens, 

 reaching one inch and a half in its longitudinal diameter. The per- 

 foration is of an oblong form, rounded at each extremity and slightly 

 contracted in the middle. In very young specimens the vertex is vi- 

 sible, recurved, and directed towards the posterior, which might cause 

 it to be mistaken for another genus. When the shell has attained 

 the length of one quarter of an inch this recurvature is lost. 

 1. Dentalium costatum, Sow. (Min. Con. t. 70. f. 8). 

 Sutton. I Sutton. | | 



Perfect specimens have a dorsal cleft at the posterior extremity to 

 the depth of a line ; the aperture is then partially covered with a con- 

 vex sort of epiphragm which has a cleft across it, as is well represent- 

 ed in D. fissura of Sowerby's ' Genera'; this I have only seen when 

 the posterior extremity has attained the diameter of nearly a line : very 

 small specimens (corresponding in all other respects, and as such I 

 have considered them as the young of this species) have a circular 

 opening at the posterior extremity without the cleft. The number 

 of costae in this species varies from ten to eighteen, with occasionally 

 a small one between them. My largest specimen measures one inch 

 and seven- eighths, but fragments indicate a greater magnitude. 



Dent, striatum, Mont. Test. Brit. p. 495, appears, from the de- 

 scription, to correspond with my small specimens. 



1. Velutina laevigata (Helix laevigata, Linn. Syst. p. 1250. Bulla ve- 



lutina, Miiller, ZooU Dan.). 



Sutton. I I Bramerton. | Britain. 



2. — elongata, Forbes (Report Brit. Assoc. 1839, p. 80). 

 This has been identified by Mr. Forbes. 



(Sigaretus similis ? Woodward, Geol. of Norf. t. 3. f. 8). 

 I I Thorpe. | Britain. 



3. — capuloides, n. s. 



Sutton. I I I 



1 . Marsenia depressa. 



Sutton. I I I 



