Remarlis on Certain Species of N. A. Helicidce. 137 



Helix cereolus Ifliihli'eldt. 



I liave already quoted the original description of this species 

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

 figure, published by W". G. Binuey in his Suppl. pi. T7, fig. 23. 



The whitish shell, H. cereolus 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 

 Eiver, 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 septemvolva (fig. 1.) and cereolus 

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

 umbilicus, and of tlie aperture, and also that Miihlfeldt's figure, 

 especially of the umbilicus, agrees rather with the latter than 

 the former. 



Fig. 1. Fig. 2. 



H, septemvolva Sai/. H, cereolus Muhl, 



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

 only half the width of that in septemvolva ; the last whorl is 

 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 & Son, 90 Fulton Street, New Tork, 

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

 establishment, on the block, I gladly avail myself of this opportunity of calling 

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



