78 
MONOGRAPH OF THE GENUS STROPHIA. 
DISTRIBUTION AND HABITS. 
The Brown Strophias occur on the west end of Little Cayman, low 
down in the thick scrub. They are quite solitary in habit, and rather 
rare, but it is probable that they range through the higher growdh of 
woodland of this section, at least as far east as the mangrove swamp of 
which I have spoken. 
20. STROPHIA SNCANA Binney. 
Gray Strophia. 
Plate VII, 20 & 20a, shell; Fig. 13, a, front, b, right side; 
Pupa incana Binney, Terr. Moll. N. A., I p. 109; III, 1851. 
DESCRIPTION. 
Sp. Cii. Size, small. Shell, thin. Striations, absent. Teeth, 
two, both short and not prominent. Whirls, 11. Examined 1,000 spec- 
Form of shell, cylindrical, with the first 
two whirls equal in diameter and the third is 
slightly smaller and the fourth is a little less 
in size, from this, the shell tapers to a blunt 
point, forming an angle of 65 degrees. The 
lines of growth are only faintly defined, but as- 
sume more prominence on the back of the upper 
whirl. Sutures, not deep. 
Aperture, large, open, measuring a little 
more just within than at the entrance. The 
lower tooth is not prominent, .02 high by .08 
long, and its position is just a little to the right of the center; the upper 
is a mere protuberance, yet makes a complete turn around the column. 
Margin, not produced forward beyond the diameter of the shell, nor 
is inclined to either side, is very thin, measuring onl v. 02, and the edges 
are slightly rolled backward. Frontal bar, not well developed. 
Color of shell, externally, grayish white throughout; internally, yel- 
lowish white. 
DIMENSIONS. 
Size of type; 1.05 by .40. Largest specimen, 1.07 by .67; smallest, 
.67 by .35. Greatest diameter, .41; smallest, .30. Longest specimen, 
1.05; shortest, .67. 
A B 
Fig 13. 
