178 LIMNiEAD^. 



crease, scarcely tapering above ; penult turn not particu- 

 larly short, generally filling more than a quarter of the 

 total length ; apex small. Body, if anything, rather longer 

 than the spire, ventricosely rounded ; its basal declination 

 moderately quick. Mouth occupying one half the length, 

 suboval, rather abruptly angular above, occasionally tinged 

 with chestnut brown. Outer lip a little projecting, regu- 

 larly arcuated ; its edge not sinuated. Pillar lip straight- 

 ish, flatly and broadly reflected as a white plate, which is 

 not appressed, but exhibits a decided perforation behind 

 it ; fold not marked. Extreme length half an inch, with a 

 breadth of three lines. 



The animal, which differs from its allies in no remark- 

 able particulars of form, varies in colour from pale brown- 

 ish grey to nearly black. 



This species often coats its shell with mud, and is much 

 in the habit of living on the margins of streams and 

 ditches, out of the water. It is universally diffused, living 

 in all sorts of watery places, and occurring at considerable 

 elevations among mountains. 



L. glaber, Midler. 



Elongated, cylindraceous, turreted, whorls rounded ; aperture 

 very small. 



Plate CX XIV. fig. 1. 



Bucdnum glabrum, Miller, Venn. Ter. et Fluv. vol. ii. p. 135 (probably). 

 Helix octona,* Penn. (not Linn.) Brit. Zool. ed. 4, vol. iv. p. 138, pi. 86, f. 135. 



* Dr. Pulteney having forwarded a supposed Dorset shell thus named (Pult. 

 in Hutchins, Hist. Dorset, App. p. 49) to Montagu, the latter identified it as a 

 common West Indian species, the Achatina octona of authors (Pfeif. Monog. 

 Helic. vol. ii. p. 260). The drawing of //. octona in the Linnean Transactions 

 (vol. viii. pi. 5, f. 10) — the accompanying description (p. 211) is transcribed 

 from that of Linnaeus — represents a broken lipped specimen of this Achatina. 



