86 MOLLUSCA FROM THE CRAG. 



Axis, yq of an inch. 



Locality. Cor. Crag, Sutton. 



Ramsholt and Gedgrave. Recent, British Seas. 



A very abundant species at Sutton, iu the Coralline beds, but I have not met 

 with it from the Red Crag Formation. 



My fossil specimens are much larger than any recent individuals that I have 

 seen ; but Mr. Alder and Mr. Loven consider the fossil as identical with the 

 recent British species, and I have given it upon their authority. It is very 

 variable ; some specimens have the volutions subangulated at the base, with a 

 small indistinct ridge in one variety, which has also the umbilicus covered, while, 

 in others, the base is without the angular appearance, and the umbilicus open. 

 The angulated edge of the volution gives a subcanaliculated form of suture to 

 another variety (fig. 3 a). All my specimens are smooth and glossy, with lines 

 of growth occasionally visible. 



2. Odostomia pupa. Dubois. Tab. IX, fig. 5, a — b. 



Melania pupa. Dubois. Geol. Wolhyn. Podolien, pi. 3, fig. 34-35, 1831. 

 Odostomia pupa. S. Wood. Catalogue 1842. 



Od. Testa minutd, turrifd, elongato-conoided, crassd ; anfractibus 6 — 7 planatis ; 

 lonyiludinaliter plicatis ; plicis 12 — 14 subrectis, confertis ; superne lesviyatis, inferve 

 striis duobus, transversis in struct is ; aperturd ovali ; columella obsolete, unidentatd. 



Shell small and strong, turreted, elongato-conical ; whorls flat, longitudinally 

 costated or plicated ; folds obtuse, nearly erect, and numerous ; with two trans- 

 verse stria? at the lower part of the volution ; aperture ovate, acuminated at the 

 upper part, with an obsolete fold upon the columella. 



Axis, yo of an inch. 



Locality. Cor. Crag, Sutton. 



Abundant. There is a slight difference between our shell and the figure given 

 by M. Dubois ; but, as far as the description goes it appears to correspond ; and I 

 presume the two shells to be identical. In his figure the transverse lines are 

 smaller and closer. The Crag shell has a tooth a little above the middle of the 

 columella, very distinct in broken specimens. The outer lip curves at the lower 

 part, giving a slight flexure to the costae, which are smooth and obtuse, and nearly 

 as wide as the spaces between them. The two transverse lines are visible upon 

 the last volution only, one being hidden in the suture of the spire ; these lines are 

 large and rounded, but do not cross the costae, only bind them, as it were, together, 

 and do not alter the form of the outer lip. 



3. Odostomia pellucida. Adams. Tab. IX, fig. 4, a — b. 



Turbo pellucidus. Adams. Linn. Trans, iii, p. 66, t. 13, fig. 33-34. 



— decussatus. Mont. Test. Brit. p. 322, t. 12, fig. 4, 1803. 



_ _ Thorpe. Mar. CoDch, p. 169, 1844. 



Odostomia reticulata. S. Wood. Catalogue 1842. 



