1906.1 



NATURAL SCIENCES OF PHILADELPHIA. 



551 



forate, the other smaller and umbilicate ; but as yet both characters 

 intergrade, and all the forms certainly occur together. 



Measurements of Polygyra indianorum. 



Polygyra indianorum lioderma Pils. Pi. XXI, figs. 14, 15. 

 Proc. A. N. S. Pliila., 1902, p. 511. 



Red Fork, Creek Co., I. T. This form is intermediate between P. 

 indianorum and P. roemeri, being much less regularly and less distinctly 

 striate than the former. It has not before been figured. 



Polygyra roemeri (Pfr.) is a terminal member of the divesta-india- 

 norum series, smoother than any of the more northern forms. 

 Polygyra divesta (Old.). 



This snail is now known from the following places. Names of|the 

 collectors are indicated by initials: F., Ferriss; P., Pilsbry; S., Sampson. 



Missouri: Springfield, Green Co. (F.); Cedar Gap, Wright Co. (F.); 

 Chadwick, Christian Co. (F. and P.) ; Seligman, Barry Co. (F.) ; also 

 reported from Jasper and Dade counties (S.). 



Kansas: Fort Scott, Bourbon Co. (S.). 



