218 PLANORBIS. 
10, 11,12. Px. Orsconensis, Tryon. Am. 
Jour. Conch. i, 231, t. 22, f. 17, 
1865. No. 15, 
13, 14, 15. Pu. rraeiris, Dunker. Kiister’s 
Chemnitz, 46, t. 10, f. 41—43. 
Binney, |. c. 122. 
— Pu. trivotvis, Say. Hald. Monog. 13, t. 
2, f. 4—7. 
16. Pl. macrostomus, Whiteaves. Canad. 
Naturalist, viii, 113, 1863. No, 16, 
17—19. Px. truncatus, Miles. Winchel’s 
Geol. Michigan, 238, 1861. No, 18, 
(65) 
