11 
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 
moutt ; 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. SEPTEMYOLVA. — 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 ; 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. 
