"10. STROPHIA GLABER Novo.

Little Smooth Strophia.

Plate II, 10 & l0 B, shell:

DESCRIPTION.

SP. CH. Size, very small. Shell, rather heavy. Striations, ab­sent. 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 tapers to a blunt point, making an angle of 60 degrees. There are only faintly defined lines of growth which, however, assume more prom­inence 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 midway 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 downward. 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 yellowish 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 speci­mens, 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 cccurs on the west end of Cayman Brac, 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 con­cealment." (Maynard, 1889:25-26)