GASTEROPODA. 171 



This IS not so rare as the preceding species, from which it appears to differ, in 

 being more elongated, with a more acuminated apex, and with the volutions less 

 convex. The aperture in this measures about half the entire length of the shell, but 

 that is a character hable to vary, and not alone to be depended upon, as those 

 proportions would alter by the simple elevation or depression of the spire. This species 

 has a more attenuated form, and the plication or fold upon the columella is less 

 prominent than that of the preceding. 



4. ACT.EON LEViDENSis. S. Woocl. Tab. XIX, fig. 4, a — b. 



Melania auricula (?). Grat. Bord. foss. p. 7, pi. .^, fig. 4, 1838. 



AcT^EON LEVIDENSIS. S. Wood. Catalogue 1842. 



ToRNATELLA ELONGATA (?). Ntjst. Coq. foss. de Belg. p. 426, pi. 3", fig. 23, 1844. 



A. Testa minutd, turrito-cylindricd, spird elevatd ; apice obtuso ; anfractibiis quinque 

 convexiuscidis, fransversim regulariter mlcatis ; sidcis imhricatis ; aperturd angustd ; 

 colunielld uiiiplicatd. 



Shell small, tapering, and elongate, subcylindrical, thick and strong, with an 

 elevated spire, and obtuse apex ; whorls five, slightly convex ; striated or sulcated 

 transversely ; suture distinct and deep, with an obtuse fold upon the columella ; outer 

 lip sharp, slightly curved. 



Axis, '- of an inch. 



Locality. Cor. Crag, Sutton. 



I have found fifty specimens of this species, nearly all of the same size, and pre- 

 sume it to be a full-grown shell. It is covered with elevated transverse striae, or rather 

 ridges, amounting to about twelve or fourteen, in the last volution, the furrows 

 between which are decussated by elevated lines of growth, and it has an obtuse fold 

 upon the columella. Melania auricula, Grateloup, may possibly be the same as our 

 shell, but the figure by that author represents his species as much larger, and without 

 a fold upon the columella ; and his description, " transversim subtillissime striata," 

 does not correspond with our shell, in which the striae or ridges are very broad, flat 

 on the top, and smooth. M. Nyst, at p. 426, speaks of Tornatella elongata as an 

 English Crag shell ; I have carefully compared my Barton specimens of what I con- 

 sider to be Sowerby's Acfaon elongatus, and they are, I think, quite distinct from my 

 Crag specimens, and Mr. Edwards could not identify any of his Eocene shells with ray 

 Crag species. 



Both the Crag and Barton species were sent by myself to the Count du Chaste! 

 some years since, and a mistake respecting the localities may have occurred. 



