11 i 



the preceding whorl, and carinate ; umbilicus dilated, very small 

 within, and exhibiting a groove on the outer whorl. 



Breadth of the female nearly half an inch, of the male about 

 three-tenths. Inhabits Florida. Cabinet of the Academy. This 

 curious species we found near St. Augustine, East Florida, in a 

 moist situation. They were observed in considerable numbers ; 

 the color is reddish brown, indistinctly banded with whitish lines, 

 sometimes with darker ones, mouth white. 



P. AVARA. — Shell covered with numerous short, robust hairs ; 

 spire convex ; whorls four, regularly rounded, with hardly elevated 

 lines forming grooves, which are much more conspicuous near the 

 mouth ; mouth subreniform, two projecting, obtuse teeth on the 

 outer lip within, separated by a deep sinus ; outer lip elevated, 

 equal, describing two-thirds of a circle ; pillar-lip elevated, broadly 

 but not profoundly emarginate, concave beneath, and connected to 

 the inner side by an elongated, lamelliform tooth, which is placed 

 obliquely on the penultimate whorl, near the middle of the mouth ; 

 lips almost equally prominent, continued ; umbilicus moderate, not 

 exhibiting the volutions, no groove on the untimate whorl within it. 



Breadth quarter of an inch. Inhabits Florida. Cabinet of the 

 Academy. Animal longer than the breadth of the shell, acute 

 behind, above granulated and blackish, beneath, and each side, 

 white. 



This we found in the orange groves of Mr. Fatio, on the river 

 St. John, East Florida ; it is usually covered with a black, earthy 

 coat, which is probably retained and collected by the hairs. When 

 unencumbered with this vesture, the shell is of a horn color. It 

 is by no means so common as the preceding species. 



P. SEPTEMVOLVA. — Shell much depressed, discoidal -, spire not 

 prominent : whorls seven, perfectly lateral, compressed, depressed, 

 and marked with conspicuous lines and grooves above, a projecting 

 carina on the upper edge of the body whorl, beneath which the lines 

 and grooves are obsolete 5 aperture subreniform, not contracted ; 

 lips equal, elevated, outer one reflected, regularly rounded so as to 

 describe two-thirds of a circle ; pillar-lip projecting inwards, into 

 an angle or tooth, which is concave beneath ; beneath the four 

 exterior volutions equally prominent, transverse diameters equal 

 to those of the upper surface ; umbilicus central, moderate, at- 

 tenuated to the apex so as to exhibit the remaining volutions. 



