MONOGRAPH OF THE GENUS STROPHIA. 
11 
DIMENSIONS. 
Size of types, 1.27 by. 57 and 1.23 by .50. Largest specimen, 1.27 
by .58; smallest, 1.00 by .48. Greatest diameter, .58; smallest, 47. 
Longest specimen, 1.47; shortest, 1.00. 
OBSERVATIONS. 
There is some variation in form as well as in size, some individuals 
exhibiting a tendency to become shorter and proportionately wider than 
the type, but this character in uninjured and perfectly adult specimens 
is not very marked; on the other hand, at one point within the range of 
the species, I found a colony having nearly parallel sides; that is the three 
first whirls are nearly equal in diameter, and the margin is not as thick 
as that of the type, measuring only .08, the type being .12; an approach 
to this form is figured on Plate II, 1b. In color, the species is quite uni- 
form; some are slightly flecked with brown, but this is rare, and they 
are oftener white to the apex. The striations are most numerous and 
most regular in the cylindrical form. They vary in number from 17 to 
24 on the first whirl. The whirls vary from 10 to 12. 
Known from all others by the large size, elongated teeth, irregular, 
widely separated, coarse striations, thickened margin, and white color. 
DISTRIBUTION AND HABITS. 
The Ragged Strophia occurs on the west end of the island of Little 
Cayman, living on the coarse vegetation which grows among the rocks 
that lie just above the beach. I have never found them east of the little 
cove, on the north side, called Bloody Bay, where the rocks of what is 
known as the Iron Shore terminate, nor east of the few houses which 
constitute the only settlement on the key, on the south side; thus they 
occupy a line, somewhat broken, of a few yards in width and about three 
miles long. This narrow strip was occupied by them almost exclusively, 
insomuch so that out of three hundred Strophias that I gathered in a 
two mile walk, twelve only were of another species, (S. levigata ). 
In habit they differ from many of the species occurring on the Cay- 
mans, in being rather solitary, at best only a dozen or so being found 
together, consequently they were not abundant. At the time of my visit 
the last week in April, the weather was mainly dry, and they were cling- 
ing to the low, stunted plants, or to rocks, and not feeding. Upon ex- 
amining the basket, in which I had placed some during the day, late in 
the evening, I found them crawling actively, and upon being brought 
north, they were occasionally active until cold weather, when they all 
died, but for at least six months they lived entirely without food of any 
description. 
