PLANORBIS. 



217 



PLANORBIS. 



Synonymy and Reference to 

 Plate 6 . 



Fig. 



1, 2. Pl. multivolvis, Case. Am. Jour. Sci- 

 ence. 2d ser. iii, 101, f. 4, 5, 1847. 

 Binney, 1. c. 111. No. 11. 



3, 4, 5. Pl. Ammon, Gould. Bost. Proc. v, 

 129, 1855. 



6. Pl. Traskli, Lea. Proc. Philad. Acad. 



viii, 80, 1856. 

 Observ. xi, 113, t. 23, f. 70. No. 12. 



7, 8, 9. Pl. tenuis, Philippi. Neuer Conch. 



i, f. 23—25. 

 Binney, 1. c. 113. No. 14. 



(64) 



