MONOGRAPH OF THE GENUS STROPHIA. 
23 
DIMENSIONS. 
Size of types, .90 by .40 and .95 by .40. Largest specimen, 1.07 by 
,45; smallest, .75 by .32. Greatest diameter, .45; smallest, .46. Long- 
est specimen, 1.07; shortest, .75. 
OBSERVATIONS. 
Among the large amount of shells that have passed through my 
hands, the typical form prevails, but there are, at least, four distinct 
forms in which certain characters are quite constant, but there is by far 
too large a percentage of gradation between them and the types, to ad- 
mit giving them a name, excepting, perhaps in one instance. The first 
form that I shall mention, is of small size, the smallest dimensions given, 
but the proportions are the same, however, as the types; next comes one 
that is more cylindrical than the types, the third whirl being but little 
smaller than the those above it, and it is proportionately more slender; 
then we have a shorter and proportionately much thicker form in which 
the width is but a trifle less than one half the length; in these three forms, 
the whirls are 10. The fourth form is one that has occasioned me some 
perplexity; it is large, the largest size given, the shell is quite thick 
and heavy, the aperture is inclined somewhat to the right, and above all, 
the whirls are 11. Could I have been sure that this shell gathered in 
localities of its own, apart from others, I should consider that it pos- 
sessed important characters enough to entitle it to a name, but I cannot 
remember that I found it separate anywhere, nor did I make any notes 
on it. In color of S. copia, there is a slight inclination to a brownish 
flecking. 
Known from all others by the numerous striations, 22 or more, size, 
.75 or more long, 10 or 11 whirls, absence of any decided markings, and 
long teeth. 
DISTRIBUTION AND HABITS. 
The Common Strophia occurs on the west end of the island of Cay- 
man Brae, and at a fishing camp on the north side of Little Cayman, 
also scatteringly about the houses on the west end of this key, but was 
probably carried to the two latter named places, by the inhabitants, the 
animals crawling upon their boats, or lumber, etc., and were in this 
manner transported. 
I do not remember ever having seen any species of Land Shell, 
more abundant this species of Strophia. In the shrubbery that bordered 
the paths and roads about the west end of Cayman Brae, they were 
very common, clinging to the base of the bushes, in masses, but their 
stronghold was the cocoa-nut grove on the south shore of the key, just 
