Notice of Land and Freshwater Shells. 5 



under surface of the outer whorl ; tlie lirst row nearly opposite 

 to the aperture, the second between the first and the parietal 

 tooth ; in one specimen, the second row is immediately behind 

 that tODth, and visible through the shell just within the 

 aperture. 



Helix Vancouver eois is Lea Trans. Amer. Phil. Soc. vi., ST, pi. 

 23, f. 72. 



Mr. Isaac Lea described this from specimens bronoflit by 

 Mr. Nnttall from the banks of the Columbia River, Oregon. 

 In 1840, Dr. Binney (Bost. Jl. iii. 372) considered it the same 

 as IL concava Say, although he afterwards (Terr. Moll. ii. 166), 

 in deference to the opinions of others, treated it as distinct. 

 The two are certainly very closely allied. Dr. Gould described 

 LI. sjportella^ (Bost. Proc. ii. 167) in 1846; it was brought by 

 the U. S. Exploring Expedition ii-Din Puget Sound, Oregon. 

 Gould's differs from Lea's species in having the incremental 

 strise more or less decussated by revolving lines, giving it a 

 granulated appearance. In some individuals the decussation 

 is to a great extent obsolete, or confined to the upper whorls 

 only, and it seems to us that the two species cannot be sepa- 

 rated. The same differences prevail in forms of the Cuban II. 

 Sageinon Beck. H. vellicata Forbes is certainly identical with 

 Lea's species. 



//. Vancouverensis has a wide distribution. Dr. Cooper col- 

 lected it " on the west side of the Coeur d' Alene Mountains, W.T. 

 in the forests of Coniferse, &c., such as it inhabits west of the 

 Cascade range." He remarks, " there is a wide plain between 

 those two ranges quite uninhabitable by Helices on account of 

 drought, for a distance of about two hundred miles, but this 

 species and //. Townseyidiana Lea probably extend round its 

 north end through the forests near lat. 49" N." AVe have 

 it from the vicinity of Crescent City, California (Dr. W. 



* In form and sculpture //. sportella is curiously allied to H. euxpira Pfr. from 

 Venezuela. 



