MONOGRAPH OF THE GENUS STROPHIA. 
141 
HABITS AND DISTRIBUTION. 
In my account of S. ritchiei, I have said that there is a range of 
hills along the eastern side of Highburn Key. At the Northern end 
of the key these hills terminate in a conical peak which is about a 
hundred feet high. The sides of this hill are not only very steep but 
but are composed of crumbling lime rock, and were it not for the fact 
that itisc overed everywhere with a dense growth of trees it would be 
almost impossible to climb it. 
This hill is the home of typical S. gray] and here they are very 
abundant, living by preference on the stems of a kind of wild fig tree 
which has white bark. 
Form No. 1 occurs at the base of the hill on the western side, 
while No.2 occurs on the flats near thenorthern bay, and the singular No. 
3 in the vicinity of the ruins of the house on the top of the hill, midway 
of the eastern arm of the key. The range of S. grayi may be thus 
given, as from the ruin, of which I speak, northward along the esatren 
border of the range of hills about a mile to the northern hill, when it 
extends all over this hill, thence westward across the plain, passing 
through the forms No. 1 and 2, to the bluffs on the western borders of 
the key, thence northward about one half the length of the key, to a 
deep gorge that makes in from the sea, just north of a point of cliffs. 
Then, excepting along the very edge of the cliffs, the species is replaced 
by the small sub-species described. 
38 STROPHIA GRAYI GIGANTEA Novo. 
Gigantic Strophia. 
Fig. 44, A, front view. 
DESCRIPTION. 
Sp. Ch. Size, very large. Shell, heavy. Striations, present. 
Whirls, eleven. Examined fifty specimens. 
Form of shell, cylindrical, the first, second and third whirls are 
about equal in diameter, the fourth is but little smaller, then the shell 
slopes gradually to a rather acute point, forming an angle of sixty- 
five degrees. The striations are few, twenty-three to the first whirl. 
Are not prominent, quite regular, and arranged in lines ; they are 
slightly inclined from right to left, are rather narrow, hence the 
interspaces between them are wider than they ; they are not furrowed, 
but are smoothly rounded, but not polished. 
