168 HELICID^. 



or six volutions ; aperture semicircular, without 

 any tooth ; the peristome simple, without margin 

 or rib; umbilicus minute, (t. 7. f. 80.) 



Pupa edentula. Drap. Hist. Moll. p. 59. t. 3. f. 28, 29.; 



Pfeiffer; Alder, Mag. Zool. and Bot. ii. 112.; Turion,Man. 



ed. 1. 99. t. 7. f. 80. — Turbo offtonensis. Sheppard, Linn. 



Trans, xiv. 155. — Vertigo nitida. Ferns. Prod. Moll. 64. 



— Alasa nitida. Jeffreys, Linn. Trans, xvi. 358. 515. — 



Turbo muscorum, var. Montagu, T. B. 35fi. — Jaminia 



edentula. Risso, E. M. iv. 89. — Alaea revoluta. Jeffreys, 



Linn. Trails, xvi. 515. 558. — Turbo edentulus. Wood, Cat. 



Suppl. t. 6. f. 14., young. — Pupa (Sphyradium) edentula. 



Charpent. 15. — Helix exigua. Studer, in Cuxe's Travels, iii. 



430. — Vertigo edentula. Sluder, Schr. Conch. 89. ; Gray, 



Man. 199.; liossm. Icon. x. f. 646. — Vertigo lepidula. Held. 



Isis, 1837, 307. — Alaea edentula. Beck, Ind. 85. — Stomo- 



donta edentula. Mermett, M. Pyr. 54. 

 Var., shell more elongated and cylindrical. 



Marshy places, at the roots of grass, under stones 

 and on trees. 



Animal grey ; upper tentacles clavate. 



Shell the tenth of an inch long, horn-colour, trans- 

 parent, slightly striate ; spire composed of five or six 

 rounded and deeply divided volutions ; aperture with 

 a very thin margin, without the rib behind the outer 

 lip. 



The young shells are very transparent light horn- 

 colour, and brittle ; the apex of the adult shell is 

 often whitish and slightly eroded. 



Montagu was acquainted with this shell, but had 

 not fixed it as a distinct species. 



It is very probable that this is the true Turbo mus- 

 corum of Linnasus, as it most accurately answers his 

 definition in the Systema Natures. " Testa ovata 

 obtusa pellucida, anfractibus senis secundis, apertura 

 edentula." 



