114 EOCENE MOLLUSCA. 



mella is furnished with three distinct folds, of which the middle one is the largest and 

 the posterior one the smallest ; the outer lip is slightly reflected, but not so as to cover 

 the umbilicus. 



This species, in its general form, much resembles C. pyramidalis (Sow.), but the 

 whorls are not so convex, and the sutures are nearer to each other, so that the spire 

 is shorter and the aperture longer and narrower. The columella also presents three 

 folds, instead of the two which distinguish the crag species. 



The shell figured is, I believe, unique ; it is one of the many valuable additions 

 made to our Eocene fauna by the " English Natural History Society," under the able 

 direction of Mr. Charlesworth. It forms part of the collection in the Museum of the 

 Philosophical Society of York, who have kindly allowed me the use of it for 

 description. 



Size. — Axis, 7- 1 Oths of an inch nearly. 



Locality. — High Cliff, Hampshire. 



Genus 17th. Pedipes.* Adanson. 



Pedipes, Adanson, 1757. 



— Ftruss., 1819; Menke, 1828; Desh., 1832; Beck, 1S37; Bronn, 



1838; Gray, 1839; Swain., 1840; G. Sow., jun., 1842; 

 Desk., 1843. 



— (sec. B), Blainville, 1825. 

 Polydonta (sp.), Fischer. 

 Bulimus (sp.), Bruguiere. 

 Tornatella (sp.), Lamarck. 

 Auricula (sp.), Reeve. 



Gen. Char. — Shell small, thick, sub-globose or oval ; spire pointed, not much 

 elevated: aperture sub-ovate or linear; outer lip thin, sharp, with one or two folds 

 within; columella with two folds; one large fold on the penultimate whorl. 



This genus was proposed by Adanson on a small marine shell from the coast of 

 Senegal ; and, although it was confounded by Bruguiere with Bulimus, and by Lamarck 

 with Tornatella, it appears to have been generally adopted. The animal, which 

 Adanson describes as very small in comparison with the shell, is furnished with two 

 filiform tentacles, oculated at their inner bases ; the muzzle is rounded and notched in 

 front, as in Melampus and Limncea; the foot is elliptical and divided into lobes sepa- 

 rated by a deep transverse furrow; the anterior lobe is transverse, wider than long, 

 and rounded in front ; the posterior one longer than wide, and somewhat narrowed 



* Etym. Adanson gave the name Pietin (quasi pieton, a walker,) to this genus on account of the singular 

 way in which the animal walks, and the Latin name, Pedipes, imposed by him, lias probably reference to 

 this peculiarity. 



