THE NAUTILUS. 93 



Polygyra appressa Say. Farmington. One of the shells did not 

 have the umbilicus covered. 



Polygyra inflccta Say. Rivermines. In three of the shells the 

 umbilicus was not covered. 



Polygyra monodon Rack. Rivermines. The small, widely um- 

 bilicated shell, not distinguishable from the northern shell, except 

 that the color is not uniform, but usually more or less in stripes with 

 the lines of growth alternately light and dark-colored. A shell from 

 Jackson, Cape Girardeau county, shows the same stripes. 



Polygyra fraterna alicice Pils. Farmington and Rivermines. 



Pyramidula solitaria Say. Farmington. 



Pyramidula alternala Say. Farmington and Rivermines. 



Pyramidula penpectiva Say. Farmington and Rivermines. 



Balimulus dealbatus Say. Rivermines. 



Pupoides marginata Say. Rivermines and Farmington. 



Bifidaria armifera Say. Rivermines and Farmington. 



Zonitoides arboreus Say. Rivermines :ind Farmington. 



Vitrea indentata Say. Rivermines. 



Helicodiscus lineata Say. Farmington. 



Cape Girardeau County. 



Three places in this county were visited : Allanville in the White- 

 water river bottom, Cape Girardeau on the Mississippi river, and 

 Jackson on higher ground between. 



Polygyra albolabris alleni Weth. Cape Girardeau. 



Polygyra thyroides Say. Allanville and Cape Girardeau, the 

 largest from the former, 28^ mm. diameter. 



Polygyra clausa Say. Jackson. 



Polygyra pennsylvanica Green. Jackson. This is the only place 

 in the State where living shells have been found. 



Polygyra fraudulenta Pils. Allanville. Somewhat larger than 

 those from Fern Glen, 17^ mm. diameter. 



Polygyra appressa Say. Cape Girardeau, Allanville. Those 

 from Cape Giradean vary from the small light colored, very finely 

 striated shells to the larger, dark colored, coarsely striated, but not 

 the same as large, dark reddish colored ones from Allenville, which 

 Pilsbry reports similar to some Arkansas and Illinois shells. They 

 are an unusual variety. An interesting specimen shows that by 

 some injury a part of the last whorl was broken away, and a new 



