86 MOLLUSCA FROM THE CRAG. 



Axis, ^ of an inch. 



Locality. Cor. Crag, Sutton. 



Ramsholt and Gedgrave. Recent, British Seas. 



A veiy abundant species at Sutton, in the CoraUine 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 M. 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 umbihcus 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, turritd, elonf/ato-conoided, crassd; anfractibiis 6 — 1 planatis ; longi- 

 fudinalifer plicatis ; 2^licis 12 — 14 si/brecfis, confertis ; superne Imvigatis, ivferne striis 

 diiobus, fransversis insfnicfis ; aperturd oi^ali ; coIumeUd obsolete, imidenlatd. 



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

 costated or plicated ; folds obtuse, nearly erect, and numerous ; with tAvo transverse 

 striae at the lower part of the volution : aperture ovate, acuminated at the upper part, 

 with an obsolete fold upon the columella. 



Axis, ~ 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 midcUe of the columella, very distinct in broken 

 specimens. The outer lip curves at the lower part, giving a slight flexure to the costse, 

 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. 



TuEBO PELLUCIDUS. Adams. Linn. Trans, iii, p. (kj, t. 13, fig. 33-34. 



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



— — Ttiorpe. Mar. Conch, p. 169, 1844. 

 Odostomia eeticulata. S. Wood. Catalogue 1842. 



"s^ 



Od. Testa pusilld, ehngato-ovatd, pellucida Q) tenui, et fragili ; ajnce obiuso ; 



