MONOGRAPH OP THE GENUS STROPHIA. 
107 
MONOGRAPH OF THE GENUS STRQJPHIA. 
(Continued from Yol. I, page 197.) 
I continue my article upon the genus Strophia with the additional 
advantage of another season’s work among the Bahamas. In March 
and April, 1893, in company with Messrs. Curtiss and Thorndike I 
visited New Providence, and some of the adjacent keys, TIighburn, 
U Key, and other keys about Allen’s Harbor, Andros from Fresh 
Creek south to Middle Bight, taking in the out-lying keys off the 
coast. As will be seen by the following descriptions, my ideas 
regarding the limited distribution of species in this genus have not only 
not been changed, but my opinion in this respect has been greatly 
strengthened. Mr. Curtiss, who is an experienced naturalist, and 
who followed me in my investigations step by step, examining with me 
the Strophias in their native haunts, early became convinced of the 
justice of my conclusions regarding the species. 
A careful study of the keys on which Strophia occur, with the 
idea of accounting for their distribution, has revealed two facts. One 
is, that these shells never appear on any key on which palms do not 
grow. Another is, they do not live on any key which is not now 
inhabited by man, or which has not been inhabited by him in the past, 
or which is not now frequently visited by him, or which has not been 
in bygone times a resort of human beings. Palms not only indicate a 
more or less fertile soil, but as they are useful to mankind in several 
ways, prove attractive to him ; hence their presence is an index of a 
present or past occupancy of any key. And the shells are probably 
transported from place to place by man. 
27 STROPHIA CURTISS!! Novo. 
Curtiss’ Strophia. 
Fig. 33, A, young ; B, side view of type ; C, front view of the same. 
DESCRIPTION. 
Sp. Ch. Size, rather below medium. Shell, rather thick and 
heavy. Striations, prasent. Animal almost wholly brown in color. 
Whirls, 10. Examined 2,000 specimens. 
