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 Hot. ii. 112.; Turton,Man. 
ed. 1. 99. t. 7. f. 80. — Turbo offtonensis. Sheppard, Linn, 
Trans, xiv. 155. — Vertigo nitida. Ferns. Prod. Moll. 64. 
— Alsea nitida. Jeffreys, Linn. Trans, xvi. 358. 515. — 
Turbo museorum, var. Montagu, T. B. 356. — Jaminia 
edentula. Risso, E. M. iv. 89. — Alaja revoluta. Jeffreys, 
Linn. Trans, xvi. 515. 558. — Turbo edentulus. Wood, Cat, 
Suppl. t. 6. f. 14., young. — Pupa (Spbyradium) edentula. 
Charpent. 15. — Helix exigua. Studer, in Coxds Travels, iii. 
430. — Vertigo edentula. Studer, Schr. Conch. 89.; Gray, 
Man. 199.; Rossm. Leon, x. f. 646. — Vertigo lepidula. Held, 
Isis, 1837, 307. — Alsea 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 Linnaeus, as it most accurately answers his 
definition in the Sy sterna Naturae. Testa ovata 
obtusa pellucida, anfractibus senis secundis, apertura 
edentula.” 
