DESCRIPTION OF SPECISS. 
197 
am inclined to think the former hypothesis the more correct one, for my 
studies of this genus lead me to believe that the lighter, thinner shelled 
species are the most recent. At all events S. brownei is distinct enough 
from alba at present. The shell is much smaller, thicker, with a con- 
siderably thickened margin Avith decided striations extending to the 
seventh whirl. There is a form of Browne’s Strophia which has more 
widely separated striations than in the type, 19 or 20 to the first whirl, 
and these are wider on top. This form bears a strong external resem- 
blance to S. fusca, even to a brownish tinging between the striations, 
but a glance at the teeth will serve to separate the two species, brownei 
having a short, inconspicuous tooth, while fusca has the long tooth so 
characteristic of the Cayman species, in short, the two shells belong to 
different groups. (See remarks on page 130.) There is a shell on New 
Providence of which I have seen two or three specimens only, which 
may prove identical with this, but I shall have occasion to speak of this 
later. 
Strophia brownei may be distinguished then from all others by the 
thickened margin with contracted opening, with the short teeth placed 
well within it, and oval form. 
I have named this species for my friend Mr. Frank C. Browne of 
Framingham, who has evinced a great interest in my work on the genus 
Strophia, and to whom I am greatly indebted for the use of many speci- 
mens. It was in his cabinet that I saw a shell that called my attention 
to this speeies. 
DISTRIBUTIONS AND HABITS. 
Strophia brownei is found on Rum Key near the north side, and 
occurs among low shrubbery, where it appears to be not uncommon. 
While crossing the key on the day that I visited Hartford Cave, men- 
tioned in a preceding article, I saw numbers as I rode along the road 
and fully intended cellecting them as I returned, but when I passed the 
place in the evening, darkness ’prevented me from securing any, and I 
did not have an opportunity of visiting the locality again. 
(continued. ) 
