43 

 PILEOLUS plicatus. 

 TAB. CCCCXXXII.— ^^. 1 to 4. 



Spec. Chah. Obtusely conical, with diverging 

 ridges extending to the edge; margin 

 irregularly crenated ; the centre of the base 

 divided. 



Syn. Pileolus plicatus, G. B. Soiverhys Genera, 



X HERE is an elevated margin to the flat cushion like 

 centre of this species, and this centre is moreover di- 

 vided into two parts by a slight sulcus that does not oc- 

 cur in the following ; the height is not much less than 

 the diameter of the base ; the inner lip is strongly 

 crenulated. 



Found along with the following, but rare. Fig. 4, is 

 magnified. 



PILEOLUS laevis. 



TAB. CQCCXXXW.—fg. 5 to 8. 



Spec. Char. Shell rather flat, smooth, with an 



entire margin. 

 Syn. Pileolus Igevis, G* JB. Soiverhys Genera, 



JVIore depressed in form than the preceding ; the cen- 

 tral portion of the base is convex, not circumscribed 

 Avith a margin, nor divided as in P. plicatus ; the inner 

 lip is obscurely crenated ; the upper surface is nearly 

 smooth in general, but sometimes it has irregular indis- 

 tinct furrows ; in a word, the general plainness and flat- 

 ness of its contour distinguishes it from the P. plicatus, 

 Fig. 8 is a magiufled representation. 



