26 
DESCRIPTION OF SPECIES. 
tapers to a blunt point, making an angle of 60 degrees. There are 
only faintly defined lines of growth which, however, assume more prom- 
inence on the back of the upper whirl, but these prominences are widely 
separated and irregular. The sutures between the whirls are not very 
deep. 
Aperture, rather small, but open, the diameter of the cavity slightly 
increasing just within the entrance; the lower tooth is placed midw’ay 
between the two walls, is .16 long and .08 high, and the upper which 
is situated just above it, measures only .02, but makes a complete turn 
around the column. 
The margin is not produced forward beyond the diameter of the 
shell, and is somewhat thickened, measuring .08, and the outer posterior 
portion is provided with a blunt and not prominent edge which is not 
curved dowmvard. The frontal bar is quite prominent. 
Color of shell externally, bluish white marked with abraded patches 
of purplish yellow. The frontal bar, teeth, and margin, externally and 
internally, are yellowish, but within the aperture, this color gradually 
deepens into } r ellov T ish purple which pervades the whole interior. 
DIMENSIONS. 
Size of types, .62 by .33 and .65 by .30. Maximum size, .88 by .34; 
minimum, .61 by. 32. Greatest diameter, .37; shortest, .30. Longest, 
.88; shortest, .61. 
OBSERVATIONS. 
This species bears the same relation to S. parva that S. perplexa 
does to copia, and though I have seen but comparatively few specimens, 
I cannot consistently do anything else but name it. There is a tendency 
to assume both a cylindrical and a short, thick form. As in S. perplexa, 
there are scattering prominences on many of the whirls of some speci- 
mens, but they are not conspicuous enough, nor uniform enough to be 
considered striations. 
Known from all other species by the absence of striations, small 
size, and long teeth. 
DISTRIBUTION AND HABITS. 
This species of Strophia occurs on the west end of Cayman Brae, 
near the northern terminus of the path that crosses the key near the 
houses. 
I found this species very rare on the margin of the path near the 
area occupied by S. parva. They were rather solitary in habit, and 
occurred on the low herbage which offered them an opportunity for con- 
cealment. 
