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 liable 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. Action levidensis. S. Wood. Tab. XIX, fig. 4, a — b. 



Melania auricula (?). Grat. Bord. foss. p. 7, pi. 5, fig. 4, 1838. 



Action levidensis. S. Wood. Catalogue 1842. 



Toenatella elongata (?) Nyst. Coq. foss. de Belg. p. 426, pi. 37, fig. 23, 1844. 



A. Testa minutd, turrito-cylindricd, spird elevatd ; apice obtuso ; anfractibus quinqae 

 convexiusculis, transversim regulariter sulcatis ; sulcis imbricatis ; aperturd angustd ; 

 columella uniplicatd. 



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, y of an inch. 



Locality. Cor. Crag, Sutton. 



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

 presume it to be a full-grown shell. It is covered with elevated transverse striee, 

 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 strias 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 consider to be Sowerby's Actaon elongatm, and they are, I 

 think, quite distinct from my Crag specimens, and Mr. Edwards could not identify 

 any of his Eocene shells with my Crag species. 



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

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



