PLANORBIS. 217 
PLANOBBIS. 
SYNONYMY AND REFERENCE TO 
PLatTeE 6. 
Fig. ; 
1, 2. PL. muttivotvis, Case. Am. Jour. Sci- 
ence. 2d ser. iii, 101, f. 4, 5, 1847. 
Binney, 1. c. 111. No. 11. 
3,4, 5. Px. Ammon, Gould. Bost. Proc. v, 
129, 1855. 
6. Pl. Traskii, Lea. Proc. Philad. Acad. 
viii, 80, 1856. 
Observ. xi, 113, t. 23, f. 70. No, 12, 
7,8, 9. Pu. tenuis, Philippi. Neuer Conch. 
i, f. 23—26. 
Binney, 1. c. 113. No. 14, 
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