22 
DESCRIPTION OF SPECIES. 
colony, and between them and the several species that occupied the 
west end of the island were miles of rocky country and the mangrove 
swamp- I found them very abundant, clinging to the fallen cocoa-nut 
leaves and other debris that lay upon the ground. They were gathered 
in close clusters of many individuals, often one top of another. 
8. STROPHIA COPIA Novo. 
Common Strophia. 
Plate I, 1 & 3, jaw; 7, 8, 9, 10, 11, & 12, structure. 
Plate II, 8 & 8b, shell. 
DESCRIPTION. 
Sp. Ch. Size, medium. Shell, rather heavy. Striations, pres- 
ent. Tentacles, about one third as long as eye peduncles. Teeth, 
two and quite long. Whirls, 10. Examined 10,000 specimens. 
Form of shell, cylindrical, with the first three whirls about equal in 
diameter. From the third whirl, the shell slopes rapidly to a point,, 
making an angle of 65 degrees. The striations are rather numerous, 
23 on the upper whirl, prominent, and regular, although not arranged 
\ mines; they are slightly inclined from right to left, and the interspaces 
are about one third as wide as the prominences. The striations are 
very slightly furrowed on the top, and the edges are quite smooth and 
rounded. 
Aperture, large and open, measuring a trifle more just within than 
at the entrance- Lower tooth, not very prominent, .05 high by .20 long, 
and its position is a little more than its width to the right of the cen- 
ter; the upper is not as prominent, is placed considerably above it, .05,, 
and measures .02, but makes a complete turn around the column. 
Margin, not produced forward beyond the diameter of the shell, 
but is inclined slightly to the right, beyond the side; it is not greatly 
thickened, measuring .06, but the outer posterior portion is produced 
backward into a thin, but not prominent, edge that is rolled slightly 
downward. The frontal bar is quite prominent and interrupts the stri- 
ations. Animal, not large; jaw, smooth. 
Color of shell, externally, white. The frontal bar, teeth, and mar- 
gin, externally and internally, are flesh color, but within the aperture 
this color gradually deepens into purplish browm, which pervades the 
whole interior. Color of animal, horn, with a Y-shaped mark of brown 
on the back. 
