﻿PULMONATA. 



341 



the figure and description given by M. Deshayes. The species, as he says, much 

 resembles the young state of PL rotundatus, but the sutures are deeper, and it approaches 

 nearer in form to PL Sparnacensis. This latter shell is, however, spirally striated, 

 whereas our species is said to be perfectly smooth — a feature which our specimens, being 

 casts, of course do not show ; but Sparnacensis appears to have a larger number of 

 volutions in the same space, and from what can be seen of the form of the volution in 

 our specimen it appears to have had a semilunate aperture, the volutions on the under 

 side being rather more convex than those on the upper, which is the flatter of the two. 



The figure represents a specimen from Mr. Bott's cabinet, and is the most perfect one 

 that I have seen. 



Planorbis elegans, F. Edwards, ' Eocene Moll.,' p. 107, tab. xv, fig. 12 a — b, so far as 

 figures and description go, appears to correspond with PL Baudoni, Desh., ' An. sans 

 Vert, du Bas. de Par.,' t. xi, p. 750, pi. xlvi, figs. 28—31. 



Genus 12tk. — Limn^ea. Lamarck. 

 For generic description see ante, p. 81. 



No. 263. LiMNiEA elongata, Marcel de Serres. Tab. XXXIV, fig. 10. 



Lihneus elongatus, Sandb. Land- und S'ussw. -Conch., p. 287, t. xvi, fig. 6, 1872. 

 — — Marcel de Serres. Ann. Sci. Nat., p. 179, pi. xii, fig. 7, 1844. 



Spec. Char. " Testa ovato-conicd, turritd, apice peracutd, anfractus septem paulo 

 convexi, suturis tenuibus disjuncti, transversim subtiliter striati, ultimus inflatior ■§ omnis 

 altitudinis cequat ; aperturd ovali, basi _paido dilatatd columella tenui, paulo contortd." — 

 Sandberger. 



Height, 1^-th of an inch ; width, \ an inch. 



Locality. Hordle (S. Wood). 



Three individuals of this form are in my cabinet, having been found by myself at 

 Hordle, and I have assigned them to the above species with some doubt. 



The spire of this shell is small and tapering, with about eight volutions ; these are 

 slightly convex like those of L. longiscata, but there is no flatness or semisulcation on 

 the left lip or columella ; on the contrary, this is sharp and prominent. It seems also to 

 differ from L. fusiformis, which has more flattened volutions, and a comparatively larger 

 aperture. I had previously considered it as an aberrant form of L. pyramidalis with 

 closer volutions. Figure 11 of the same Plate represents a specimen belonging to the 

 recent British species, L. stagnalis, which I have introduced in order to show the varia- 



