WATSON : NOTKS ON NOMENCLATURE OK HYGROMIA, HKIJCELI.A, ETC. 285 



their anatomy, but also to name them in accordance with the Rules 

 and Recommendations of the International Code, adopting no 

 changes which the Rules do not recjuire, should use the following 

 names for those groups of British snails with which the present paper 

 is concerned : — 



Family HELICID^. 

 Genus Hygroniia Risso, 1826. (Type: H. cinctella Drap.). 

 Subgenus Hygromia, s.s. 



Section ZenobieUa Gude and Woodward, 192 1. (Type: H. 



subriifescens W\\\&x^H. ftisca Mont). 

 Section Hygroniia s.s. 

 Subgenus Trichia Hartmann, 1840. (Type : H. hispida Lin.). 

 Section Trichia s.s. 



Section Ponentina Hesse, 1921. (Type: H. subvirescens 

 Bellamy). 

 Genus Helicelia Ferussac, 1821. (Type: H. ericetoruni Miill. = ^7! 

 itala Lin.). 

 Subgenus Cermiella Schliiter, 1838. (Type: H. variabilis 



Drap = H. virgata Da Costa). 

 Subgenus Helicelia s.s. 



Subgenus Helicopsis Fitzinger, 1833. (Type: H. striata Miill.). 

 Subgenus Candidula Kobelt, 1871. .(Type: H. candidula Stud.). 

 Subgenus Trochoidea Brown, 1827. (Type : H. elegans QmtXm). 

 Family ZONITID^. 

 Genus Euconulus Reinhardt, 1883. (Type : H. fiilva Miill.). 

 Genus Vitrea Fitzinger^ 1833. (Type: H. diaphana (Stud.) Fitz.). 

 Genus Oxychilus Fitzinger, 1833. (Type : H. cellaria Miill.). 

 Genus i^6'/'///^//<'j (Shuttleworth) Fischer, 1877. (Type: H. olive- 

 torum Gmelin). 

 .-Genus Zonitoides Lehmann, 1862. (Type : H. fiitida Miill.). 



Acanthinula lamellata var. albida and A. harpa near Boras, Sweden. — 



The white form of A. lamellata hA not been described in scientific literature as far 

 as I know. It is to be found on the slope of a range of hills just west of Bora's in 

 various places, especially in and about a rather great cleft situated about 200 

 metres above the sea, among mouldering twigs and leaves. You can also find the 

 main form there, though in considerably smaller number. The form is quite 

 invariable, because it has been observed and gathered by me for the last four years. 

 Other species which are to be gathered there do not show any tendency to diverf^e 

 in colour. A. harpa occurs in the same mountain chain. This habitat seems to be 

 quite isolated from other localities in Sweden where the species is known to occur— 

 the nearest is about 200 English miles further north. Here, according to my 

 opinion, it must be considered as. a relic from a late glacial period. — Berthold 



SUNDLER. 



