MONOGRAPH OE THE GENUS STROPHIA. 
35 
developed, yet the striations appear within it, but they are not very 
prominent and extend back far into the shell. 
Color of shell, externally, shining white; within, deep purplish 
brown, pale on the tooth and internal striations. Margin, pale brown. 
DIMENSIONS. 
Size of type, 1.10 by .40. Largest specimen, 1.28 by .45 ; smallest 
.85 by .38. Longest specimen, 1.28 ; shortest, .85. Largest diameter 
.45, smallest, .35. 
OBSERVATIONS. 
Typical specimens are wholly white externally, but there is a 
strong inclination to become rosy at the apex, this feature is more 
prominent in the form given below. There are also other forms. 
Form No. 1. Shorter, and proportionately stouter than the type. 
The apex is distinctly rosy and there are occasional lines of dark viola- 
ceous. This form exhibits a tendency on one hand to revert toward S, 
ianthina, and on the other toward S. rubicunda. 
Form No. 2. Very short, .85, with the margin thickened and bev- 
eled. Color similar to that of form No. 1. 
Form No. 3. Larger than the type, 1.28 by .45, with the margin 
much thickened, at least .75, and inclined to be double. Color, similar 
to that of the type. 
Form No. 4. More slender than the t} r pe, measuring .35 in dianr 
eter, white in color. 
I cannot give the relative proportions of these forms nor their ex- 
act locations, as I did not make sufficiently, careful notes on them when 
I collected them. 
This is the species which in many collections is labeled Pupa alve- 
aria, but erroneously, as I shall endeavor to show. The Turbo alvearia 
of Dillwin (Description Catalogue, II, page 315) was based partly upon 
the Alvearia buccinum of Seba and partly upon the Bulimus fusus of 
Burguiere ( Encyclopedic Methodique, des vers, Vol. 1. page 348) hence 
must be considered as a synonym of Bulimus fusus. What the Alvea- 
ria, buccinum of Seba was, is very doubtful, but it is quite probable 
that neither he nor Burguiere had a true Strophia in hand, when they 
made their description, and even if they had, their description does not 
apply to any Inagua shell with which I am aquainted. Dillwin dis- 
tinctly says his Turbo alvearia, was “ white without and within ” and 
this appears to be a correct interpretation of the authors upon whose de- 
scription he bases his specific characters. Now this does not apply to 
any Strophia from Inagua which I have seen, for all, without exception 
