PLANORBIS. 215 



PLANORBIS. 



Synonymy and Reference to 

 Pl ate 5. 



Fig. 



1, 2. Planorbis subcrenatus, Carpenter. Lon- 

 don Zool. Proc. 220, 1856. 

 Binney, 1. c. 103. No. 1. 



3, 4. Pl. Hornii, Tryon. Am. Jour. Conch, 

 i, 231, t. 22, f. 16, 1865. No. 2. 



5, 6. Pl. tumens. Carpenter. Mazatlan, Cat. 

 181. 

 Binney, 1. c. 106. No. 3. 



7, 8, 9. Pl. gracilentus, Gould. Proc. Bost. 

 Soc. V, 129, 1855. No. 4. 



(62) 



