MONOGRAPH OF THE GENUS STROPHIA. 
29 
cold of winter, and one other species occurring in the pine woods on the 
island of New Providence, to be mentioned later. 
It is evident that in this species, we have a Strophia dwarfed to an 
exteme degree, from feeding on the pungent leaves of the plant described, 
and isolated as it is by surrounding areas of rough, jagged rocks, the 
process of diminution has gone as far as it can go and allow the animal 
to live as a Strophia, with the ordinary habits of Strophia. The ground 
was strewed with thousands of dead shells, showing that mortality among 
them was great, and the, perhaps, recently acquired habits of seeking * 
the shelter of rocks is one to which they are driven in order to preserve 
the species from utter extermination, but it is doubtful whether they 
will even keep their generic characters under this new mode of existence, 
For further remarks upon this very interesting subject consult General 
Conclusions. 
12. STROPHIA NUDA Novo. 
Naked Strophia. 
Plate II, 12 & 12b, shell. 
DESCRIPTION. 
Sp. Ch. Size, medium. Shell, thin. Teeth, two, short. Stria- 
tions, absent. Examined three specimens. Whirls, 10 & 11. 
Form of shell, cylindrical, the first four whirls being about equal in 
diameter; then the shell curves to a blunt point, making an angle of 65 
degrees. There are only faintly defined lines of growth which are more 
prominent on the upper whirl. Sutures, deep, with whirls bulging. 
Aperture, large and open. Lower tooth, placed to right of center, 
is not prominent, and is .10 long by .03 high; the upper is a mere eleva- 
tion at the entrance, is larger within, but is short. 
Margin, not produced forward quite as far as the diameter of shell, 
and is inclined slightly to the right; it is thin. Frontal bar, not large. 
Color of shell externally and internally, dark flesh, yellowish at 
apex, and fading to nearly white on margin and teeth. Shell, polished. 
DIMENSIONS. 
Size of types, 1.00 by .39 and .82 by .32; other specimen, .89 by .38. 
OBSERVATIONS, 
Although I have only three of this singular Strophia which I found 
near Clarence Harbor, Long Island, Bahamas, I have ventured to name 
it, as I have never seen anything like it. Known at once by the cy- 
lindrical form, bulging whirls, short teeth, and naked, flesh colored shell. 
(continued.) 
