List of the Mollusca of Missouri. 101 



ClRCINARIHXE. 



circinaria Beck. 



116. Circinaria concava Say. 



Pettis Co. (2) ; Columbia, Boone Co. (6) ; Pop- 

 lar Bluff, Butler Co. (3) ; St. Francois Co. (1) ; 

 New Madrid, New Madrid Co. (1) ; Camden Co. 

 (1); Scott Co. (1); Fern Glen, St. Louis Co. 

 (7) ; Moniteau Co. (2) ; Macdonald Co. (4) ; Bear 

 creek, Marion Co. (1); Galena, Stone Co. (1); 

 Kansas City, Jackson Co. (1) ; Chadwick, Chris- 

 tian Co. (Pils. & Fer.) ; Callaway Co. (Greger). 



Postpliocene : — Lupus, Moniteau Co. (6) ; Prov- 

 idence, Boone Co. (8) ; Near St. Louis (Ham- 

 bach). 



ZoNITIDiE. 

 ZoNITINJE. 



omphalina Rafinesque. 



117. Omphalina fuliginosa Griff. 



Scott Co. (4) ; Carthage, Jasper Co. (1) ; Jack- 

 son, Cape Girardeau Co. (1) ; Macdonald Co. 

 (2) ; Seligman, Barry Co. (2) ; Warsaw, Ben- 

 ton Co. (2) ; Marble Hill, Bollinger Co. (1). 



Pilsbry and Ferriss say that the early whorls of fuligi- 

 nosa are invariably white, the cuticle being worn off. This 

 is the case with all of the above except that from Marble 

 Hill, but it is not full grown and is of only %y 2 whorls. 

 They describe a variety fuliginosa ozarkensis, which has 

 fine spiral striae, but none of the above show such lines. 



118. Omphalina friabilis W. G. B. 



Cape Girardeau, Cape Girardeau Co. 



These shells are of large size, up to 28 mm. diameter, 

 and with apex entirely unworn. 



