Clapp : Notes on Land Shells. 535 



evidently wrong, as he gives the greater diam. as 25 mm., while Say 

 gives the size as "nearly I i inch," or about 29 mm., and The Terres- 

 trial Mollusca says "over i^ inch," or about 32 mm. 



3. Pyramidula solitaria mynesites* var. no v. 



On Mouse Island, a small island at the end of Catawba Id., Ottawa 

 Co., Ohio, Mr. Goodrich found a small form of solitaria which is so 

 distinct from all of the other forms of the region that I distinguish it 

 by the above varietal name. 



Shell small, solid, straw-colored, with two brown bands, the lower 

 wider and darker than the upper one which is sometimes almost 

 obsolete. Apex pink like var. roseo-apicata. Whorls 5^/^. 



Compared with vars. strontiana and roseo-apicata it is constantly 

 much smaller and intermediate in color, but with the banding of the 

 latter. Over two hundred were collected and measurements of 

 thirty-seven mature she Is gave the following results: 



Diam. 20.12, Alt. 14.61 mm.. Index 72.61 average, 

 21.00, " 16.00 " " 76.20 largest, 



" 18.50. " 13.50 " " 72.97 smallest, 



" 20.00, " 16.00 " " 80.00 most elevated, 



" 20.50, " 14.00 " " 68.30 " depressed. 



Types No. 7232 of my collection. Paratypes in collections of 

 Bryant Walker, Detroit, I\Iich., and Calvin Goodrich, Toledo, Ohio. 



In May 191 6 Mr. Goodrich again visited Mouse Island, and col- 

 lected a large number of P. solitaria, many of them juvenile, how- 

 ever. In a letter he says: "The solitaria ranged bigger than in my 

 collecting of 191 2, but compared with other findngs I believe the form 

 will stand as a dwarf race." The largest shell found this year 

 measures 23.5X18.5 mm., index 78.72, and the smallest, 18.5 X 12 mm., 

 index 70.28. The average of twenty-nine shells measured is 21.20X 

 15.26 mm., index 71.98. Mr. Goodrich also made a study of the 

 banding of two hundred forty-one shells, adult and young, and found 

 that two were bandless, thirteen had a single band and one hundred 

 seventy-seven had the lower band stronger than the upper. 



4. Pyramidula altemata eriensis var. nov. 



On the islands at the western end of Lake Erie and the islands of 

 Maumee Bay, Michigan, a very heavy, roughly ribbed, elevated, 



*From nvs =mouse; vqalTris = islander . 



