156 MONOGRAPH OF THE GENUS STROPHIA. 
No. 2 is larger, with nine whirls, thicker margin, and with a 
heavier shell. This form in some respects resembles S. n. agava and 
was it not for the fact that it differs in color, and has a lower, wider 
aperture, resembling the type S. carlotta, and that S. n. agava inter- 
grades directly with S. neglecta, it might be supposed to be the direct 
origin of the Agava Strophia. 
The Fort Charlotte Strophia may be know r n by the peculiar oval 
form, less wide aperture, and reddish color. This species resembles 
S. glans more than it does any other shell in form, but in S. glans the 
shell is white, and the aperture rather higher than wide and the 
margin thicker. 
HABITS AND DISTRIBUTION. 
Strophia carlotta occurs in the immediate vicinity of Fort Char 
lotte, New Providence. The type locality is at the foot of the hill, on 
which the fort stands, on the north side. Here they were found on 
low bushes and herbage. Further up the hill toward the fort, almost 
under the shadow of the walls of the small old Spanish fort, wdiich 
stands a little to the eastward of the large structure, occurred the small 
form No. 1. 
To the westward of the type locality, nearer the bushes and 
among them, we collected the larger from No. 2. 
I think the origin of the dwarf form can be traced directly to the 
dryness of the soil on the hill top. At the time of my visit in March, 
1893, the foliage of the shrubbery w r as so parched with heat and lack 
of moisture that it crumbled in the hand. We have seen another 
instance where a dwarf form has been produced by a dry environment 
in Strophia nana, on Little Cayman, but the extreme pigmy size of this 
species was also probably due, partly, to feeding upon a peculiar plant. 
See Yol. I of these contributions, page 27. 
45 STROPHIA GLANS Kuester. 
Acorn Strophia- 
Fig. 50, A, front view, B, side view, of type form. 
Pupa glans Kuester in Chemn. ed. II, Pupa, page 74, plate il, 
figs. 1 and 2. 
DESCRIPTION. 
Sp. Ch. Size, rather below medium. Shell, not heavy. Stria- 
tions, present. Whirls, ten, Examined 1,000 specimens. 
