List of the Mollusca of Missouri. 105 



Postpliocene : — Providence, Boone Co. (17); 

 Glasgow, Howard Co. (5) ; St. Joseph, Buchanan 

 Co. (9) ; Bellevue (Hambach) ; Lexington (Ham- 

 bach). 



The collection has a sinistral shell from near Colum- 

 bia, the first reverse land shell I have found in the State. 



128. Pykamidula solitaria Say. 



St. Francois Co. (3) ; Bollinger Co. (1) ; Fern 

 Glen, St. Louis Co. (1) ; Morgan Co. (1) ; Cam- 

 den Co. (6) ; Pettis Co. (6) ; River bluffs, Moni- 

 teau Co. (10) ; Columbia, Boone Co. (6) ; Bonne 

 Terre, St. Francois Co. (Walker Coll.) ; Cooper 

 Co. (Walker Coll.) ; Callaway Co. (Greger); 

 Dent Co. (1) ; St. Charles Co. (5). 



Postpliocene: — Providence, Boone Co. (22); 

 Lupus, Moniteau Co. (8). 



I have specimens from Indiana 28^2 mm. diameter, 

 while those from Pettis county are only 22. 



GONYODISCUS Fitz. 



129. Pyramidula perspectiva Say. 



St. Francois Co. (13) ; Madison Co. (1) ; Marble 

 Hill, Bollinger Co. (12) ; Jackson, Cape Girar- 

 deau Co. (15) ; Poplar Bluff, Butler Co. (9) ; 

 Benton, Scott Co. (9) ; Seligman, Barry Co. (8) ; 

 River bluffs, Moniteau Co. (4) ; Cureall Springs, 

 Howell Co. (Walker Coll.); Chadwick, Chris- 

 tian Co. (Pils. &Fer.). 



Postpliocene: — Providence, Boone Co. (1). 



helicodiscus Morse. 



130. Helicodiscus lineatus Say. 



Sedalia, Pettis Co. (20) ; Warsaw, Benton Co. 

 (4); Nevada, Vernon Co. (2); Dade Co. (5); 



