MONOGRAPH OF THE GENUS STROPHIA. 
13 
The few prominences of growth that have any claim to be considered 
striations, are confined to the upper portion of the first whirl, usually 
near the aperture, but in some instances, they extend around to the 
left, to a point nearly opposite the margin, but in no case do they ex- 
tend past this point. These are evidently reversions toward the stria- 
ted form, which is probably the original species on the key, as the 
majority of the species here are provided with striations. 
Known from all other species by the large size, absence of striations, 
pointed apex, long teeth, white color, and thickened margin. 
DISTRIBUTION AND HABITS. 
This species occurs on the west end of Little Cayman, very spar- 
ingly on the coast, and rather more commonly among the low growth of 
trees in the interior. They occupy an extent of country, about three 
miles long by a mile in width. 
The habits of the Smooth Strophias are even more solitary than 
those of the Ragged Strophias, as they occur in isolated groups of four 
or five individuals, and these groups are scattered at rather wide inter- 
vals along the only two paths that cross the key anywhere; these start 
together on the south side but emerge about a mile apart, on the north 
side, near the west end. They may have occurred elsewdiere in the in- 
terior, but the almost impassable character of the thick jungle, and the 
rough ground from which it springs, render traveling very difficult, often 
impossible without cutting away the shrubbery. 
3. STROPHIA INTERMEDIA Novo. 
Small Rough Strophia. 
Plate II, 3 & 3b, shell. 
DESCRIPTION. 
Sp. Ch. Size, rather small. Shell, quite thin and not very robust. 
Striations, present and coarse. Tentacles, not very short, about one 
third as long as the eye peduncles. Examined 3,000 specimens. 
Form of shell, short oval, the greatest diameter being on the second 
whirl, the first and third being very little smaller, and from this the 
shell tapers to a rather blunt point at the apex, forming an angle of 
about 60 degrees. There are 16 coarse, widely separated striations, 
some of which are omitted, and none of which form regular lines, but 
are somewhat inclined from right to left. The striations are wide, meas- 
uring .03, and are generally furrowed longitudinally on top, but the 
