MONOGRAPH OF THE GENUS STROPHIA. 
127 
OBSERVATIONS. 
Although in some specimens the first whirl is but little smaller 
than the second, it is always some smaller, and in the majority of cases, 
noticeably so, and also in many instances, the third whirl is larger than 
the second. There is a decided inclination among some individuals, to 
have the margin slope considerably backward, thus possibly constitut- 
ing a form. The markings described are very constant, as well as the 
number of whirls. 
This well marked species may be at once distinguished from the 
short toothed Strophias, by the inflated lower portion, absence of stria- 
tions. heavy shell, and stripings. 
DISTRIBUTION AND HABITS. 
The Swollen Strophias occur at Salena Point, Auklin Islands, Ba- 
hamas, where they were collected by Dr. Henry Bryant of Boston, many 
years ago. I obtained the specimens from which I made the above de- 
scription, from the collection of the Boston Society of Natural History, 
where through the courtesy of Mr. Samuel Henshaw, I was permitted 
to examine the Strophias. 
STROPHIA MARITIIVIA Pfr. 
Seaside Strophia. 
Pupa maritima Pfeiffer, Wirgm. Arch., 1839; I, p. 353. 
Plate XIII, 1 & la, shell: a, front, b, left side. 
DESCRIPTION. 
Sp. Ch. Size, rather large. Shell, heavy. Striations, absent. 
Whirls, 11. Teeth, rather short. Examined 50 specimens. 
Form of shell, an elongated cone, inclined 
to be cylindrical, with the first and second 
whirls equal in diameter, the third is but little 
smaller, then the shell tapers to a rather acute 
point, forming an angle of 60 degrees. The 
surface of the shell is not particularly smooth 
being somewhat thickened by lines of growth 
and some few excrescences. The sutures are 
not deep, and the three upper whirls between 
them, are only slightly bulging, the remain- 
der not at all. 
Fig. 31. 
