MONOGRAPH OF THE GENUS STROPHIA. 
25 
lowish, but this color gradually deepens within to a purplish yellow 
which color pervades the whole interior. 
DIMENSIONS. 
Sizes of types, .60 by .30 and .63 by .32. Largest specimen, .72 
by .32; smallest, .60 by .30. Greatest diameter, .37; smallest, .27. 
Longest specimen, .72; shortest, .68. 
OBSERVATIONS. 
V 
The type is very constant and the principal departure from it, is a 
form that is proportionately longer and more cylindrical, but tapering 
from the second whirl to the apex. Individuals are shorter and with a 
larger diameter than the types, with from 20 to 24 whirls and may con- 
stitute a group. In color there is an inclination to show fleckings and 
to increase the w T orn patches. The margin, as a rule, is not heavy, but 
now and then this is thickened, .10 being the extreme. 
Known from all other species, by the presence of stria tions, small 
size, less than .73 long, and long teeth. 
DISTRIBUTION AND HABITS. 
This species occurs in a very limited area, on the west end of Cay- 
man Brae. Near the northern termination of a path that crosses the 
key near the western end, is a strip of quite high shrubbery, and in this 
these Strophias lived. From this point, they were scattered at inter- 
vals, quite into the large colony of Common Strophias, in the cocoa-nut 
grove on the south side, having evidently been inadvertently transported 
by the inhabitants. 
In habit these Strophias are decidedly social occurring in groups of 
a dozen or more, clinging to the branches of the shrubbery, often at a 
considerable distance from the ground, sometimes five or six feet, dif- 
fering in this respect, from any other species that I have seen living, it 
not being usual for them to ascend more than one half of this distance. 
10. STROPHIA GLABER Novo. 
Little Smooth Strophia. 
Plate II, 10 & 10b, shell: 
DESCRIPTION. 
Sp. Ch. Size, very small Shell, rather heavy. Striations, ab- 
sent. Teeth, two, both long. Whirls, 9. Examined 16 specimens. 
Form of shell, oval, the greatest diameter being at the second whirl, 
the first and third are but little smaller, and from this last the shell 
