Proc,Ac.Nat.Sc.PMla.l875. 



Plate XN. 



T.Smdair&Sm.litti.] 



W.G.B.del. 



IHelixtiidiciiMta^^^^^, 4. Helix Trnzh^MH/c 8. Helix NicMimaiia^(?«. / •^ ^^^^ 

 2.Helix arros a, B//m 5. Helix seqTioicoh.J^^/p. 9.HelixraTnfintosa. fM. K^^ ^-iy 

 S.Heljxruficmia. J/epv. 6. Helix Avresiana.yl^r lO.Helix exarata.i^ 



