134 
MONOGRAPH OF THE GENUS STROPHIA. 
long-toothed form of S. curtissii (No. 4). 
Crossing another narrow channel, further north, we come to Hog 
Island, and at e, is Middle Bay, before mentioned, with S. cinerea 
living along its border, a widely different species from those which are 
found on the east end of New Providence. 
Crossing the hill back of the bay, then a swampy valley, we ascend 
the hills which form the beach ridge and come to the scattered colony 
of S. c. robusta, f. 
To the eastward on the southern side of the point of the island is 
the restricted colony of S. c. tracta, g. 
Crossing the Narrows, N, which are about one fourth of a mile 
wide, we find the western end of Long Island, B. 
[I will here remark, that, probably owing to the great extent of the 
Bahamas, the names of some small keys are applied to more than one 
island. For example, we have this name “ Long” applied to no less 
than three different keys : one near New Providence, as now given, one 
near Rum Key, and one in the Crooked Island Passage, further south. ] 
The buildings of the hospital occupy the western eud of Long 
Island, and to the north of them is a little bay, k, east of this bay, 
around the point, the colony of S. e. mutata begins, and extends to a 
sand-beach, midway of the key at 1, thus in the chart the western 
half only of Long Island is given. North of the western end of Long 
Island is the little rocky islet known as Spruce Key, on which two 
distinct species of Strophia live, or did live at the time of my visit, 
March 29th, 1893, namely, S albea and S. coryi (see c). 
At F, directiy north of Hog Island, is the desolate Salt Key, which 
I have not yet visited, and so cannot say whether it contains any 
species of Strophia or not. 
It is still too early in the course of my investigations to even 
speculate intelligently as to the probable origin, time of distribution^ 
etc., of the varions forms of Strophia found in this locality, but this 
chart will, I trust, prove of interest m showing the direct localities in 
which the mollusks of which we are treating occur. 
As an interesting item in the habits of S. coryi, I have to add that 
since the last sentence regarding that species was written one of the 
type specimens contained in a box on my table has left his fellows, 
crawled np the sides of the box about an inch and a half, and fixed 
itself there. Now this specimen was taken on the west end of New 
Providence on April 17th, 1893, and last night, that of December 14th, 
1894, it has shown signs of life. This shell lias, during these twenty 
