PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



NOTES ON A COLLECTION OF HELICOTD LAND SHELLS FROM 

 JAPAN AND THE LOO-CHOO ISLANDS, WITH DESCRIPTIONS 

 OF TWO NEW SPECIES OF HELICID^. 



By G. K. Gude, F.Z.S., etc. 



Mead 10th November, 1899. 



PLATE II. 



The writer has recently received two somewhat extensive collections 

 of Helicidae from Japan and the Loo-Choo Islands. Several species 

 are represented by rather large series, thus enabling some idea to be 

 formed of the amount of variation to which they are severally liable. 

 Some of the forms are fairly constant, as, for instance, Ganesella 

 myomphala, G. pap ill if or mis, JEulota (s.s.) despecta, E. (Plectotropis) 

 elegantissima, and E. (Euhadra) mercatoria ; others, however, exhibit 

 a very wide range of variation. This is especially the case with 

 E. {Euhadra) Luhuana and E. (Euhadra) peliomphala. 



Dr. Kobelt worked out the Japanese Mollusca from ample material, 

 but this was twenty years ago, and many new forms have come to 

 light since. Moreover, Ave now have, thanks to Mr. Pilsbry's valuable 

 work on the Helicidae, a more correct view of the classification of 

 these molluscs ; hence it has occurred to me that a classified and 

 annotated list of all the known species might be useful to collectors. 



Although most of the islands have been fairly explored, it is not 

 unlikely that many new forms still remain to be discovered. The 

 present collections contain two species which do not appear to have 

 been described ; and one species, Plectotropis trochula, which it would 

 seem has not been met with since it was described by Adams, is here 

 figured for the first time. 



The following is an enumeration of the species : — 



JAPAN. 



1. Pyramidula (Gonyodlscus) palter, Gld. Ten specimens. 

 Saigo, province Ugo. Previously recorded from Tokio and Hakodate. 



2. Ganesella myomphala, Martens. 1 

 Fukura, Awaji Island. Two specimens. 



Diam. maj. 33, min. 29 mm.; alt. 25 mm. 

 Tanabo, province Kii. Ten specimens. 



Diam. maj. 39, min. 36 mm. ; alt. 29 mm. 

 ;> >> 36, ,, 31 ,, ,, 24 ,, 



1 Mr. Jacobi removes this species from Eulota (Euhadra) upon anatomical grounds, 

 and for conchological reasons I agree with him. 



