ANCULOSA. 413 



This very beautiful and rather abundant species, although 

 differing very much from all others in its broad, flattened 

 colnmolla, covering the umbilicus completely, in the mouth be- 

 ing •ro.-ully inflated and rounded below, and in the whorls being 

 rounded instead of slanting, varies much in itself; so mucl" 

 so in fact as to have caused marked specimens to be described 

 as new species. Among these, the first is ^1. elegans, Anthony, 

 of which the following is the description : — 



AncAdosa elegans. — Shell subglobose, smooth, thick; spire de- 

 pressed, consisting of 3— i flat whorls ; color flue, glossy, dark yellow, 

 ornamented with darker bauds, of wliich five are 



,,,,,, , ui- 1 . , Fiff. 823. Fig. 8-21. 



on tlie body-whorl ; aperture obliquely ovate and 

 banded within; columella deeply curved, with a 

 very callous deposit; sinus very small. \f5v 



Habitat. — Alabama. 



Observations. — A highly ornamental species, which cannot be com- 

 pared with Tiny other; its bands on a yellow ground render it very 

 lively; it is heavier and smoother than A. ampla (nobis), not so 

 broad in the aperture, and far more beautiful ; neither is it so much 

 shouldered as that species. — Anthony. 



An examination of numerous specimens convinces me that 

 ampla and elegans are only variations of one species. The 

 figures given are all drawn from type specimens. The figure 

 published b}' Mr. Lea of his A.for^nosa, which is herein copied, 

 is a young ampla in form, onl}- differing from the type speci- 

 mens of that shell in the maculations, but I figure one of the 

 adult sIipHs mentioned by Mr. Lea in his description, which, 

 on account of the very light color, impressed lines and macu- 

 lations, may remain under the name of formosa as a variety. 



The following is Mr. Lea's description : — 



Anculosa formosa. — Shell smooth, globose, rather thin, semi-trans- 

 parent, yellowish or saffron color, very much banded and maculate; 

 spire depressed, scarcely conspicuous; sutures depressed; whorls 

 three, the last large and very ventricosc ; aperture large, rounded; 

 within pale saffron, with dark bands; columella thickened below and 

 above and pale purple; outer lip sharp and very much expanded. 



Operculum small, thin, with the polar poiut below the centre 

 towards the inner edge. 



