168 



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.; Turton,Man. 



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



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



Alaea nitida. Jeffreys, Linn. Trans, xvi. 358. 515. 



Turbo museorum, var. Montagu, T. B. 356. Jaminia 



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



Linn. Trans, xvi. 5 15. 558. Turbo edentulus. Wood, Cat. 



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



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



430. Vertigo edentula. Studer, Schr. Conch. 89. ; Gray, 



Man. 199.; Hossm. Icon. x. f. 646. Vertigo lepidula. Held. 



Isis, 1 837, 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 Linnaeus, as it most accurately answers his 

 definition in the Systema Natures. " Testa ovata 

 obtusa pellucida, anfractibus senis secundis, apertura 

 edentula." 



