164 
MONOGRAPH OF THE GENES STROPHIA. 
As an additional sub-generic character for Maynardia I will add 
that the young of all the Bahama Strophias, with one exception (see S. 
bimarginata), which I have examined belonging to this sub-genus have 
a single tooth, there never being even an indication of any other (see 
fig. 33, page 108, of this volume of Contributions and compare with 
figs. 1, D, and o, c, plate II, vol. I. 
[Note. In the paper cited above, Dr. Dali shows that the name 
Strophia Albers. 1850, must be abandoned for this genus, as it has not 
only been superceded by Cerion Bolton, 1799, but has also been 
preoccupied in Entomology (Mergen, Syst. Beschr. Ill, 147, 1832). To 
avoid confusion, however, I shall continue the name of Strophia until 
the close of this Monograph.] 
HABITS AND DISTRIBUTION. 
The only specimens that I ever saw of this beautiful Regular 
Strophia, were, as remarked, occupied by the young of a species of 
Hermit crab, Diobeta diogines, and appeared to be quite a favorite 
shell with them. The crabs with their adopted shells were found on 
both sides of Fresh Creek near the settlement. Some of the shells 
appeared to be quite old and much stained, but some were compara- 
tively fresh ; for example, the t} T pe, which I have figured, aside from 
the wearing away of the teeth and a small hole broken near the 
margin on the left side, is perfect, and the color of the internal parts 
is well preserved. But w T e could not discover any living specimens 
anywhere, although we searched with great care. It is probable, 
therefore, that Strophia regula is also an extinct species ; but still it 
is possible, that the shell is to be found at some distance up the creek, 
the specimens found having been brought down by the out-going tide, 
and stranded on the shore where they could be found by the crabs. 
But I made a careful search of both banks of the creek for at least two 
miles from the settlement, and found no trace of a Strophia, of any 
kind, after leaving the immediate vicinity of the settlement. Then 
again, I do not think it probable that a species of Strophia would occur 
far from the coast, for I have never found one far from the sea. 
i . 
1 ■ ■ 
48 STROPHIA BIMARGINATA Novo. 
Double-Margined Strophia. 
Fig. 53, A, front view, B, side viewq of type ; C, young (enlarged), 
D, double margin of another specimen. 
