PUPA. 105 



Alaa cylindrica, Jeffreys, Trans. Linn. Soc. vol. xvi. p. 35f). 

 Vertigo muscorum, Mich add, Conip. Draparn. Moll. France, p. 70, 



„ pupula. Held, Isis, 1837, p. 308. 

 Alcea minutissima. Beck, Ind. Moll. Miis. Christ. Frid. p. 8.5. 

 Eruca muscorum, Swainson, Malacol. p. 334. 

 Vcrtiijo minutissima, Graells, Cat. Molhis. Espag. p. 7. 

 Stomodojita muscorum, Mermet, Moll. Pyren, p. 55. 



Shell minute, thin, cylindrical, only slightly lustrous, 

 semitransparent, of an uniform pale yellowish umber co- 

 lour, closely wrinkled lengthways with rather oblique 

 raised lines. Whorls five and a half, short, much rounded, 

 of slow longitudinal increase, deeply divided by a simple 

 and scarcely slanting suture : apex obtuse. Body merely 

 filling about a third of the dorsal length ; its basal de- 

 clination more or less abrupt. 



Mouth unarmed, occupying a fourth only of the ventral 

 length, of a somewhat roundish-oval figure, being bluntly 

 angulated above, rounded and much receding below. Outer 

 lip very narrowly and thinly reflected, not thickened in- 

 ternally, jutting out rather abruptly for a short space, 

 straightish in the middle, arcuated below. Pillar lip sub- 

 trigonal, rather broadly reflected, curved anteriorly, but 

 straightish above, where it runs almost at right angles 

 to the scarcely slanting parietal portion of the inner lip. 

 Umbilical chink conspicuous. Length not one line ; 

 breadth not quite two-fifths of a line. 



The animal is rather slender, dark and streaked with 

 black on the neck and tentacles, white on the sides and 

 tail. The lower tentacles are almost obsolete. 



This is one of our rarest British Pwpee, though common 

 enough upon the Continent. The first record of it as a 

 native species is the account of it by Dr. Fleming under 

 the name of Pupa ohtusa ; to him it was communicated 

 in 1813, from Fifeshire, by Mr. Chalmers, of Kirkaldy. 



VOL. IV. p 



