242 TAYLOR: ON HELIX ARBUSTORUM. 



publishing in our next issue. It is desirable that other students 

 should take up other genera, and publish 'life histories' of the 

 species composing them; co-operation in this way will be cordially 

 welcomed. 



HELIX (ARIANTA) ARBUSTORUM L. 



Classification. 



This species is now generally placed by systematists in the 



sub-genus Arianta of Leach, a group possessing the following 



characters^ — 



Shell perforate, conic or depressed globose, whorls 5 — 6, the 

 last gradually descending, lunately rounded, peristome broadly 

 labiate, its margins parallel, the basal dilated often covering the 

 umbilicus, epiphragm membranaceous. 



This species is remarkable as being an outlying member of a 

 group having its development on the Pacific coast of N. America, 

 where its congeners appear in a. nuinber of fine species. lam 

 not aware of any species of this group being known in America 

 east of the Rocky Mountains. 



It has at various times and by various authors been placed un- 

 der the following generic or subgeneric groups : — 



Helicogena by Ferussac, Crypto7nphalus by Charpentier, Cochlea 

 by Lister and Da Costa, Ciugiilifera by Held, Arianta by Leach, 

 and Canipylcea by Frauenfeld. 



Synonymy. 



Cochlea maculata Lister. Hist. Anim. Angl. p. 119, pi. 2, f 4, 1678. 



Helix arbustorum L. Syst. Nat, loth ed., p. 771, 1758. 



Cochlea unifasciata Da Costa. Test. Brit., p. 75, pi. xvii., i. 6, 

 1778. 



Helix turgidula Wood. Index. Test. Suppl., pi. vii., f 6, 1828. 



Arla?ita arhistoru7n Leach. Brit. Moll., p. 86, 1833. 



J.C, iii., October, 1881 



