102 GASTEROPODA. LIMNADZ. 
conically-subulate. Umbilicus perforate, but closed. Tenta- 
cula elongate. Mantle not dilated. 
Synopsis Specierum. 
* Anfractus gradatim crescentes. Apertura brevis. 
1. octanfracta. Testa anfractibus octo convexiusculis, peritre- 
mate albido. 
** Anfractus ultimus medium spire vie attingens. 
2. communis. Testa anfractibus septem ; ultimo subangulato. 
3. minuta. Testa anfractibus septem simplicibus ; sutura pro- 
funda. 
*** Anfractus ultimus ventricosus. Apertura ultra medium 
spire attingens. 
be 
elegans. Testa anfractibus octo elegantissimé elongatis. 
. vulgaris. Testa anfractibus septem mediocribus. 
or 
1. STAGNICOLA OCTANFRACTA. 
S. testa anfractibus octo convexiusculis, transversim elevato- 
striatis ; interstitiis elongato-excavato-punctatis. 
Helix octona, Penn. Brit. Zool. iv. 138. pl. 86. fig. 135? 
Helix octanfracta, Mont. Test. Brit. 396.t. 11. fig.8; WM. & R. 
Trans. Linn. Soc. vii. 211; Turt. Conch. Dict. 64. 
Limneus elongatus, Drap. Hist. des Moll. 53. pl. 3. figs. 3, 4. 
Lymneea octanfracta, Flem. Edinb. Encycl. vii. 78. 
Bulimus Leucostoma. Poiret, Prod. 37. 
Habitat in stagnis, rarior. 
Shell with eight rather convex, transversely striated whorls ; 
the strize elevated ; the interstices with elongately-excavated 
punctures. Height five-eighths of an inch. 
Colour pellucid-horny, generally incrusted with black matter, 
which is independent of the epidermis. 
Inhabits ponds and ditches ; it is rare, or at least very local. 
It was found by the road-side between Fowey and Looe, by 
