Quarterly Journal of Cofichology. 219 



the coast on the ocean side of the same, come from within the same 

 physical environment, being comparatively a limited distance apart. 



The Helix belongs to an interesting and peculiar group, probably 

 varieties of one species, which includes, at present, the following 

 names : Helix areolata, Sby., H. Veitchii, Newc, H. pandorce, Fbs., 

 and H. levis, Pfr. Other forms geographically approximate may 

 hereafter, on further investigation, be referred to the same lineage. 



Of the above. If. areolata was the first described, or I should 

 say that this appears by the date to be the first name bestowed 

 upon any member of the group. This species has been quoted 

 from Oregon, and H. levis, from the Columbia River, in both cases 

 erroneously. The figures in "Land and Freshwater Shells of North 

 America," p. 177, are too elevated and globose for the typical 

 areolata, but the larger figures faithfully represent H. Veatchii. 

 Elevation and rotundity are insular characteristics in this group, 

 and areolata is comparatively depressed. It is found in consider- 

 able numbers on the uplands around Magdalena Bay, which is on 

 the outer or ocean shore of the peninsula, in latitude about 24° 

 40' N. 



Bulitnus pallidior, which is pretty generally distributed through 

 Lower California, from Cape St. Lucas northerly, has also er- 

 roneously been credited to San Diego in California proper. It is 

 arboreal in its habits, at least during the winter season, and frequents 

 the Copaiva trees. It has been said to inhabit South America, 

 which is probably incorrect, and the locality "San Juan," mentioned 

 in "L. and F. W. Shells," on p. 195, where a good figure of this 

 species may be seen, should be Sanjuaiiico, which is on the east 

 side of the peninsula, in latitude about 27° N. 



The great importance of particularity in habitat will be at once 

 perceived, when I state, that there are no less than three other 

 localities on the west coast of America, north of the place cited, 

 all of which are referred to in various scientific works, which have 



