MUSEUM OF COMPARATIVE ZOOLOGY. 205 



Zonites viridulus. Helix pulchella. 



fulvus. Ciouella subcylindrica. 



nitidus. Pupa muscorum. 

 Helix harpa. 



This list will be increased should it be proved that Mr. Gwyn Jef- 

 freys * is correct in referring the following American species to those of 

 Europe. Vitrina linipida = V. pellucida, Punctum minutissimum = 

 Helix pygmasa, Drap., Limax campestris = L. Ia3vis, Mull., Vertigo 

 Gouldii = V. alpestris, Aid., Vertigo Bollesiana = V. pygmrea, Drap., 

 V. ovata = V. antivergo, Drap., V. ventricosa = V. Moulinsiana, V. 

 simplex = V. edentula, Drap., Succinea ovalis = S. elegans, Risso, S. 

 Totteniana = S. putris, Drap. var. 



From Asia have come into Alaska the following : Vitrina exilis, 

 Patula pauper, Papa borealis. 



The species peculiar to Greenland are Vitrina Angelica, Zonites 

 Fabricii, Pupa Hoppii, and Succinea Groenlandica. Of these, Pupa 

 Hoppii has, however, also been found on Anticosti Island. 



Into this Northern Region have also been introduced by commerce 

 from Europe the following : Zonites cellarius, at most of, if not at all 

 of, the ports from New York to Halifax; Limax flavus, L. agi'estis, and 

 Arion fiiscus, which follow man over the whole United States, living 

 around his habitations; and L. maximus, also around human habitations, 

 but noticed only in Newport, R. L, New York City, and Philadelphia ; 

 Helix hispida at Halifax, Helix rufescens at Quebec, Helix hortensis on 

 the islands off the coast of New England and the British Provinces, 

 and on the mainland in Canada and Greenland. 



Of the species referred above to the Northern Region, several have 

 spread beyond its limits. Vitrina limpida has been found in Central 

 New York ; Zonites viridulus extends to Mexico ; Z. milium to San 

 Francisco ; Z. fulvus and Helix pulchella all over the United States ; 

 Zonites nitidus, Z. multidentatus, and Punctum minutissimum to Ohio, 

 the last to Texas and to California ; Cionella subcylindrica to the States 

 south of the Great Lakes and into California and New Mexico ; Patula 

 striatella to Virginia, as well as into Oregon and Nevada. 



in their migration southward by glacial agencies. There is a wide field for specu- 

 lation here. 



* Ann. and Mag. N. H., 1872, 245, 246. 



