1919.] NATURAL SCIENCES OF PHILADELPHIA. 163 



M tiller. It is curious that Bourguignat should have considered 

 them as young whitish specimens of H. cespitum M tiller. The latter 

 is however common near Nice and in the quaternary deposits of the 

 region. 



Helicella ericetorum (L.) Risso (71). Risso's specimens rep- 

 resent, not the H. cespitum as claimed by Bourguignat, but H. man- 

 tinica Mabille of the group Cespitana, a rather rare species in the 

 Alpes-Maritimes. The H. ericetorum does not occur in this region 

 where it is at present replaced by the H. ericitella Jousseaume, which 

 is smaller, less depressed, with a larger umbilicus. 



Helicella variabilis (Drap.) Risso (71). Bourguignat consid- 

 ered that there were two species on Risso's carton, H. variabilis of 

 Draparnaud and H. submaritima of Desmoulins. I have established 

 the truth of the first identification but the second is not correct, it 

 being the H. pilula Locard, which also belongs to the group of variabilis. 



The H. submaritima Desmoulins^ has been sent to me from various 

 places in France, always in the neighborhood of the ocean: Isle de 

 Re, Brest, Honfieur, Royan, etc. It is very distinctly marked by 

 its form and small size, hardly greater than that of H. striata Drapar- 

 naud. It is very distinct from H. maritima and pyramidata and 

 does not occur in the Risso collection. 



Helicella nitida (Drap.) Risso (72). ]\Iortillet wrongly identi- 

 fies this species with the Zonites {Hyalina) nitens ]\Iichaud. For 

 Bourguignat Risso's specimens constitute a new species close to 

 Z. cellarius IVI tiller. The differences are very slight. 



Helicella fasciata Risso (72). Young specimens of Helix ces- 

 pitum Draparnaud. 



Helicella ferruginea Risso (72). This is the Helix lenticula 

 Ferussac, which is found in the neighborhood of Nice. 



Helicella hispida Risso (72). This is the Helix hispida Linne, 

 very common on all the prairies. 



Helicella hispidula Risso (73). This is Helix apidna Lamarck. 



Helicella prevostiana Risso (73). A variety of Helix hispida 

 Linne. 



THEBA (Leach Ms.) Risso (73). Theba pisana (L.) Risso 

 (73). Very common on all the shores. 



7 Suppl. Moll. Gironde, p. 6, 18.51. 



