170 
MONOGRAPH OF THE GENUS STROPHIA. 
Strophia curtissii nivia in color and somewhat in form, but S. b. cera 
is larger, w T ith a smaller aperture, more widely apart striations, with 
lines of growth between. From all other Strophias this sub-species 
may be distinguished by the peculiar waxy color and thin shell, which 
is nearly as translucent as white wax, insomuch so that the animal 
may be seen through it. 
HABITS AND DISTRIBUTION. 
The few specimens of this fine Strophia which I obtained were 
taken from trees or bushes on Green Key. 
50 STROPHIA PILSBRYI Norn 
Pilsbry’s Strophia 
Fig, 55. A, front, B, side view of type. 
DESCRIPTION. 
Sp. Ch. Size, medium. Shell, rather thin and light. Striations? 
present. Whirls, ten. Examined 125. 
Form of shell, an elongated pointed oval, the first whirl being the 
largest, the second, third and fourth being successively a little smaller, 
then the shell slopes a little more 
rapidly to an acute point, forming an 
angle of sixty-three degrees, The 
first whirl is short, equalling in width 
the next four. The striations are not 
numerous, twenty-tw T o to the first 
whirl, are a little narrower than the 
interspaces between them, inclined to 
be angular, slightly ridged, with ridges 
of growth between them are not very 
regular, not at all arranged in lines 
and not in the least inclined, being 
straight from the upper whirl to the 
apex. 
Aperture, quite small, open, not 
at all inclined to the right. Lower tooth, not prominent, triangular, 
being as wide as high, and a little longer than wide. It is very 
slightly elevated, and set back from the frontal bar not quite its 
length. 
Fig. 55. 
B A 
Strophia pilsbryi. A, front, B, side view, 
of type. 
