PULMONATA. 133 



versely ridged; apex elevated; ridges slender, sharp-edged, numerous, (18 to 20), 

 regular, interrupted by a dorsal sulcus ; the spaces between the ridges regularly 

 concave ; aperture wide, with parallel margins, somewhat produced and curved behind, 

 terminating in a short, wide canal, and slightly notched in front ; the outer lip, towards 

 the middle, is curved correspondingly with the shape of the body- whorl, and presents a 

 wide but not much raised border along the outer edge. The dorsal sulcus, which is 

 very distinct, becomes wider and deeper at each extremity. The transverse ridges are 

 more numerous on the right lip than across the back, as several short ones rise out of 

 the aperture, which scarcely extend beyond the outer margin. In the young shell, 

 (fig. la — c), the right lip is obscurely dentated towards the front, but is otherwise 

 smooth ; it presents a raised border along the outer edge. 



Size. — Axis rather more than 4-10ths of an inch; diameter, 3-10ths of an inch. 



Localities. — HighclhT, and Alum Bay : (Strat. No 29, Prestwick). 



No. 77. Cyprsea Wetherellii. F. F. Edwards. Tab. XVII, fig. 3a — d. 



Cypr.ea vejjiculus? Welst. (Observations on the strata over the Chalk, &c.,) Geol. Trans., 

 1st Ser., vol. ii, p. 204. 



C. testdparvd, sub-globosd, transversim lineatd; lineis tenuibus, nwmerosis; sulco dorsali vix 

 conspicuo non interruptis ; aperturd sub-mediand, leviter arcuatd, postice productd, sub- 

 canaliculatd. 



Shell small, nearly globose, slightly attenuated in front, transversely ridged ; ridges 

 thin, angular, not interrupted by the obscure dorsal sulcus, few in number as they 

 emerge from the aperture, but becoming numerous by the bifurcation of some, and by 

 the appearance of new ridges between others ; aperture nearly central, narrow ? 

 slightly curved, produced behind, forming a short wide canal ; outer lip ? 



The specimen of this Cyprsea from which the description and figure are 

 taken is imperfect; the outer lip and the front of the columella are both broken, and 

 the shelly matter on part of the back is decomposed, exposing a cast in the pyrites with 

 which the interior of the shell is filled ; but the posterior extremity of the outer lip 

 and the triangular elevation which formed the left wall of the posterior canal remain. The 

 continuation of the transverse ridges across the back of the shell, uninterrupted by the 

 dorsal sulcus, is plainly shown. 



This Cyprsea is one of the many additions to our Eocene Fauna for which we are 

 indebted to the indefatigable zeal of Mr. Wetherell, with whose name I designate the 

 species. The specimen from which the figures are taken, was found in one of the 

 cuttings made at Whetstone, on the formation of the Great Northern Railway. 

 Another, and apparently a younger, specimen was also obtained by Mr. Wetherell 

 from the railway cutting at Primrose hill. 



