FAMILY COLIMACEA. 



81 



19. Helix lamellata. Lamellated Helix. 



Shell ; minutely deeply umbilicated, conoidly globose, olive horny, 

 subfuscous, spire obtusely raised, whorls six, 

 narrow, rounded, crossed obHquely with mem- 

 branaceous lamellae, last whorl swollen, excavated 

 around the umbilicus ; aperture lunar, lip simple. 



Helix lamellata, Jeffreys (1830), Trans. Linn. Soc. toI. 

 xvi. p. 333. 



Helix Scarburgensis, Bean (1830), Alder, Trans. Nat. 

 Hist. Soc. Korthumb. vol. i. p. 39. 



Helix seminulum, Rossmassler (1838), Icon. Moll. f. 533. 



Hob. North Britain. North Germany. Sweden. (In 

 woods, among dead leaves.) 



A very interesting small species, for the discovery of which we 

 are indebted to Mr. Jeffreys. The shell is as round as a pea, glo- 

 bosely swollen, peculiarly impressly excavated around the umbilicus, 

 which is minute and deep, and obbquely ribbed throughout with 

 membranaceous lamella?. It is essentially a northern species. It 

 is widely spread in Scotland and Ireland ; in England it has not 

 been found south of Scarborough. The only Continental habitats 

 yet recorded are North Germany and Sweden. 



20. Helix aculeata. Prickly Helix. 



Shell ; moderately umbilicated, globosely pyramidal, fuscous 

 spire raised, sutures impressed, whorls four to four 

 and a half, rounded at the upper part, obtusely 

 angled at the periphery, very finely striated, 

 crossed obliquely throughout by fibrous epidermic 

 lamella? which at the angle of the periphery are 

 elongated into lashes ; aperture rounded, Hp 

 slightly expanded, margins approximating. 



Helix aculeata, Miiller (1774), Verm. Hist. p. 81. 



Helix spinulosa, Lightfoot (1786), Phil. Trans. Hoy. Soc. vol. 

 lxxvi. p. 166. pi. ii. f. 2. 



Tela spinulosa, Leach (1831), Turt. Man. p. 100. 



Fruticicola aculeata, Held (1837), Isis, p. 914. 



Helix Granatelli, Bivon (1839), Occli. Oiom. Palerm. Mag. n. 9. f. 



G 



horny, 



