90 



Jiemarks o)i Certahi Species of 



Helix eereolii!$ MiililfelcU. 



I liave already quoted the original description of tliis species 

 at page 133, and refer to the copy of the avithor's unsatisfactory 

 ligure, published by W. G. Binney in his Suppl. pi. 77, fig. 23. 



The whitish shell, II. cereolics Muhl. var. laminifera of W. 

 G. Binney's catalogue in the Philadelphia Proceedings, which 

 we have in our cabinets, found by Lieut. Wurdeman at Indian 

 River, E. Florida, and also from Indian Key, belongs in my 

 opinion to this species. The annexed figures,* double the 

 natural size, of the base of sejjtemvolva (fig. 1.) and cereol%is 

 (fig. 2.) show the striking differences in the characters of the 

 iimbilicus, and of the aperture, and also that Miihlfeldt's figure, 

 especially of the umbilicus, agrees rather with the latter than 

 the former. 



Fig. 1. 

 H. septemvolva Say. 



Fig. 2. 

 H. cereolus Muhl. 



The umbilical opening, in specimens of about equal size, is 

 only half the width of that in septem'volva ', the last whorl i& 

 wider, especially towards its termination at the aperture, more 

 inflated, and rather less acutely carinated. The aperture is more 

 orbicular, more contracted, and the outer lip more expanded 



■' The woodcuts were executed by Waters <fe Son, 90 Fulton Street, New York, 

 admirable figures of the shells having been previously photographed, in their 

 establishment, on the block. I gladly av^il myself of this opportunity of calling 

 the attention of naturalists to this valuable method of securing accurate figures. 



