18 



-i" 't* umbilicus 

 1. mnl.iliral v, 

 1 s mill. 



i! racea, 



Dill 



g ( . Mark, with 



Mitnrr and nn tin- p-ripli 

 umltiliral wall wit!. mill. 



I!'- si I 



) a synonym. 



a from t> , lut is 



ps nnly entitled ,1 rank. 



5. 85, 8G. 



; whorN longitudinally snlcatc, <pirnlly 

 tree superior ribs the smallest : f-olor 

 ted i iiitr l>an.N above tin- sir 



on t i on the rih In-low it, and a l.rowni^li white 



. umbilical wall with two spiral ri 



the liamlin-j;, th> 

 whitish hand in tiu- ajti-i 



lig 86 a. 



with smoky In-own ,^] 



>r four spiral 

 ill. 



Wet. 



-. 87, 88. 



v -iilc:ite 

 i-an- 



uml.ilical w, i. Alt. *Jo mill. 



inds. 

 T. dwlbala, llimls, is a s\ 



