PULMONATA. 341 
the figure and description given by M. Deshayes. The species, as he says, much 
resembles the young state of P/. rotundatus, but the sutures are deeper, and it approaches 
nearer in form to P/. Sparnacensis. his 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, ¥. Hdwards, ‘ Eocene Moll.,’ p. 107, tab. xv, fig. 12 a—d, so far as 
figures and description go, appears to correspond with P/. Baudoni, Desh., ‘ An. sans 
Vert. du Bas. de Par.,’ t. xi, p. 750, pl. xlvi, figs. 28—31. 
Genus 12th.—Limnazxa. Lamarck. 
For generic description see azfe, p. 81. 
No. 263. Limwnaa nxoneata, Marcel de Serres. Tab. XXXIV, fig. 10. 
Lingus ELoNGATUS, Sandb. Land- und Stissw.-Conch., p. 287, t. xvi, fig. 6, 1872. 
_ — Marcel de Serres. Ann. Sci. Nat., p. 179, pl. xii, fig. 7, 1844. 
Spec. Char. ‘ Testé ovato-conicd, turritd, apice peracutd, anfractus septem paulo 
convex, suturis tenuibus disjuncti, transversim subtiliter striati, ultimus inflatior 3 omnis 
altitudinis equat ; aperturd ovali, basi paulo dilatatd columella tenui, paulo contorta.’— 
Sandberger. 
Height, 13th 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 Z. dongiscata, 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 Z. fusiformis, which has more flattened volutions, and a comparatively larger 
aperture. I had previously considered it as an aberrant form of Z. pyramidalis with 
closer volutions. Figure 11 of the same Plate represents a specimen belonging to the 
recent British species, Z. stagnalis, which I have introduced in order to show the varia- 
