Clapp : Notes on Land Shells. 5:^3 



For comparison nineteen shells from seven mainland localities were 

 measured. They gave an average diameter of 26.75 mm. and an 

 index of 69.35, the greatest index being 72.8. 



Type-locality Green (formerly Strontian) Island, Lake Erie, Ohio. 

 Types No. 7462 of my collection. Paratypes in collections of Bryant 

 Walker, Detroit, Michigan, and Calvin Goodrich, Toledo, Ohio. 



On Middle Sister Island a few specimens of this same high, handless 

 variety were found. They were too few, however, to make com- 

 parative measurements, but they apparently run larger. 



This is not " Pvr. solitaria albina (W. G. Binney)"' of Walker, 

 Terrestrial Molliisca of Michigan, 1899, p. 22, without description, as 

 the locality is there given as " Kent Co." In ''An Illustrated Catalogue 

 of the Molliisca of Michigan," by Bryant Walker, Rep. State Board 

 Geol. Surv. Mich., 1905, p. 492, Binney's figure 268 is copied from 

 the Manual of American Land-Shells, p. 254 and the name under 

 the original figure is changed from "\'ar. albino" to "V'ar. albina 

 (Binney) " and the statement is made: "The variety has been reported 

 from Kent county onl}."^ 



Binney probably never intended to make this a variety. In Land 

 and Fresh-Water Shells of North America, Vol. I, p. 71, it is figured 

 with the type as " Helix solitaria and albino." In Terrestrial Mollusca, 

 Vol. V, it is not listed as a variety in the Catalogue on p. 77, and on 

 p. 156 it is figured separately as "Var. albino." If he had intended 

 to describe it formally as a variety, he would surely have given the 

 name a Latin termination. It would seem, therefore, that var. albina 

 (W. G. Binney) Walker must be limited to albinos of the typical 

 banded form of the mainland. 



Binney's figure was probably drawn from one of the small shells 

 of Strontian Island, as he had them in his collection. No. 38987 of 



1 Dr. Walker has kindly furnished the following description: 



Pyramidula solitaria albina Walker. 



Pyramidula solitaria albina Walker, 111. Cat. Moll. Mich., p. 492 (exc. of figure), 

 1906. 



"This form was based on a single example in the DeCamp Collection, (No. 

 11650 Coll. Walker), from Kent County, Michigan. It is a thin greenish-white 

 shell, slightly tinged with pale horn-color. It is evidently not quite mature, as the 

 lip is thin and sharp. It has 4^^ whorls and measures, diam. 21.5, alt. 16 mm. 

 Compared with the variety from Green (Strontian) Island, which was probably 

 the original of the figure copied erroneously from Binney, it is a much thinner shell 

 and differs conspicuously in color." 



