MONOGRAPH OF THE GENUS STROPHIA. 
167 
young shells, at least I have one specimen, a very young shell, with 
five whirls only, in which five teeth appear, almost exactly as seen in 
the young specimen of S. pannosa and of S. festiva figured on Plate. 
II, Vol. I of these Contributions. Compare these figures with Fig. 
52, n, of the present volume, where 1 give a figure, twice enlarged, of 
a young S. bimarginata, taken on Green Key, in April, 181)6. I have 
also another specimen, from the same place, that is older, which has, 
besides the tooth in the usual place on the column, another on the 
upper portion of the walls of the aperture and two indications on the 
larva. Other older specimens have simply the one tooth as seen in 
all other members of the sub-genus Maynardia, but I should not be at 
all surprised to find this character appearing, at least occasionally, in 
very young specimens of other members of this sub-genus. As also 
showing a tendency to revert to ancestral types, I have two adult 
shells in which there is no indication of any teeth whatever. (See 
remarks regarding the form of sub-genus Eostrophia on page 163.) 
I have remarked that the type form of this species came from 
Green Key, off Andros, but this species also occurs on Little Galden 
Key, Middle Bight, Andros. But the shells from this latter-named 
place here have caused me no little perplexity. They appear different 
from those on Green Key, as they lie in mass in the boxes, side by 
side, and I considered them different when I collected them, but when I 
try to get at some exact character which will separate the shells from 
the two islands I utterly fail to find any which will answer even to 
represent a form. All 1 can say, is, that, on the average, or taken in mass, 
the shells from Little Galden Key are larger, coarser and darker in 
color, internally, and with an inclination to a creamy tint, externally. 
There are, however, two forms, one of which is also found on Little 
Galden Key, and a well-marked sub-species, developed on Green Key. 
No. 1 is a large, coarse form, with an inclination to assume a 
bevelled margin and single tooth, with a darker interior. This form 
also appears on Little Galden Key, but here is even larger with a 
decidedly creamy color externally. On both keys the shell is found 
in the thicket away from the beach. 
No. 2 is a small form, the smallest dimensions given, with a thin 
margin, and with a tendency toward a single tooth, although this 
is sometimes doubled. The color is dicidedly bluish, and I have two 
or three specimens which are considerably flecked. This form occurs 
among the low grass of the rocks of Green Key. 
