200 PNEUMONOBRANCHIATA. 



Turbo muscorum var. Montagu, T. B. 356. 

 Jaminia edentula. Risso, iv. 89. 

 Alsea revoluta. Jeffreys, Linn. Trans, xvi. 5 1 5. 558. 

 Turbo edentulus. Wood, Cat. Suppl. t. 6. f. 14. 

 Var. Shell more elongated arid 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 Naturae. " Testa ovata 

 obtusa pellucida, anfractibus senis secundis, apertura 

 edentula." 



Mr. Jeffreys, in his Supplement, observes, " The 

 Al&a revoluta of his Synopsis is an old bleached spe- 

 cimen, with the aperture placed more extrinsecall^ 

 than usual." (Linn. Trans, xvi. 515.) 



70. 2. VERTIGO cylindrica. Cylindrical Whorl Shell, 

 (t. 140. f. 10.) Shell attenuated, pellucid, pale 

 brown, acutely obliquely striated; whorls five, 

 convex; mouth ovate, slightly margined exter- 

 nally, toothless; umbilicus narrow. 

 Pupa obtusa. Flem. Brit. Anim. 269. ; not Drap. 



