m 
MONOGRAPH OF THE GENUS STROPHIA. 
HABITS AND DISTRIBUTION. 
All along the eastern coast of Andros stretches a barren reef which 
varies in distance from the island from one tj five miles. This reef is 
continuous excepting where it is broken at the entrance of the bights or 
creeks that make into the land. Here and there, along this reef which 
divides the lagoon between it and the land from the deep water of the 
Tongue of Ocean rose little islets varying in size from the merest points 
of rocks, just awash by the waves at high water, to keys ten acres in 
extent which rose sometimes thirty or forty feet above high water. 
One of those large islands is called Green Key. [Of keys of this 
name I know three; one near New 7 Providence, one here on the coast 
of Andros and one (a large key) about thirty-five or forty miles south 
of it, but on the opposite or eastern side of the Tongue of Ocean. | 
Tills key contains about five acres of land. It is rather Ioav, 
backed on the eastern or seaward side, by rough jagged rocks which 
are somewhat elevated, and, on the western side, along the lagoon, by 
lower, smoother reeks. Directly on the water the rocks are exposed, 
but back of them the key is covered with a dense growth of hushes. It 
was along the lagoon border that we found Strophia bimarginata. 
They were clinging in clusters of from five to twtnfc\-five or 
thirty individuals to the grass and herbage along the margin of the? 
hushes, hut were seldom found on the bushes themselves, but deeper in 
among the bushes rve found the larger form No. 1. while form No. 2 
was found on the lower herbage nearer the water. 
On Little Gulden Key, Middle Bight, which I have described on 
page 29 of these Contributions, we found the shells in a similar 
situation, but never on either kev on the eastern or seaward side. I 
w 
also found a form, corresponding to No. 1, in the woods at Little 
Gulden Kev. 
•> 
40 STROPHIA BIMARGINATA CERA. Novo. 
Waxy Strophia, 
Fig. dL A, front view, B, margin, of type. 
DESCRIPTION. 
Sp. Ch. Size, medium. Shell, thin and light. Striations, 
present. Whirls, ten. Examined nine specimens. 
Form of shell, a pointed cylinder, with the first three whirls 
