GASTEROPODA. ] 7 



Axis, g of an inch. 



Locality. Cor. Crag, Sutton. 

 Red Crag, Sutton. 



This is not abundant in either fonnation. It much resembles the preceding 

 (C Angllce), in form and paucity of ridges, but there is no longitudinal sulcus on the 

 back. The outer lip is reflected, bringing its linear opening nearly to the centre 

 of the shell. These differences, as well as its more orbicular form, strike the eye 

 immediately, and are, I tliink, sufficient specific characters. One specimen has only 

 seven ridges across the back. 



5. Cypr^a Europ^a. Mo)ii. Tab. II, fig. 6. 



CvPR^A PEDICULUS Edkop.ea. Gmel. Syst. Nat. p. 3418. 



— EuROP/EA. Mont. Test. Brit. Sup. p. 88, 1808. 



— Aectica. - - - - p. 200. 



BULLATA, JUV. - - - p. 202. 



— cocciXELLA. Lam. An. du Mus. torn, xvi, p. 104, 1810. 



— — Nijst. Coq. foss. de Belg. p. 609, pi. 45, fig. 14. 



— cocciXELLOiDES. J. Sow. Mill. Conch. t. 378, fig. 1, 1S23. 



— EuROPEA. Flem. Brit. An. p. 330, 1828. 



— EUROPJ.A. Gray. Zool. Proc. p. 14, 1832. 



— NoRVEGiCA. Sars. Beskr. og. Jag. 1835. 

 Trivia Borop.ea. S. Wood. Catalogue 1842. 



C. Testa ovato-obhngd, ventricosci ; sulcis transversis l(svibus, sulco dorsali nullo ; 

 aperturd regulariter arcuatd, postice suhproductd, dentibus cequalibus. 



Shell oblong, ovate, ventricose, transversely sulcated, ridges bifurcating, smooth, 

 raised ; aperture linear ; lower part of inner lip concave, shghtly produced. 



Axis, T, of an inch. 



Localiti/. Cor. Crag, Sutton. 



Red Crag, passim. Recent, Britain. 



This is very abundant in the Red Crag, and exceedingly variable. My largest 

 specimen reaches | of an inch in length, while the smallest is little more than j inch, 

 with ridges varying on the back from ten to twenty, bifurcating towards the edges. 

 Tlie sulci, as well as the ridges in this and all the preceding species, are quite smooth, 

 the latter being less in width than the former, and generally flat upon the top. Although 

 this species is so abundant, I have never yet been able to procure a young or immature 

 specimen. Mr. LyeU has it also from Touraine. 



In describing these shells the term transverse is given to the ridges upon the 

 exterior, while the sulcus upon the back is called longitudinal, corresponding in that 

 character with the position of the animal in its natural state, with the head in a linear 

 direction from the apex of the spire, irrespective of the volutions of the shell. 



In England these shells are called " Nuns," and in Scotland " Johnny Groat's 

 Buckie," according to Dr. Fleming. In France they have the name of Poux-de- 

 Mer. 



3 



