152 
MONOGRAPH OF THE GENUS STROPH1A. 
species of agava, I found Strophias in considerable numbers, but few 
among them were typical S. neglecta, most of them being intergrades 
between the Neglected Strophia and the Agava Strophia, or were the 
S. neglecta agava itself. Increditable as it may seem, after the most 
careful examination of specimens and the ground in the vicinity of the 
old type locality, I am forced to the conclusion that, as a species with 
a distinct locality, Strophia neglecta no longer exists. In nine years 
these shells, placed under different environment by the clearing of the 
fields, and planting of sisal hemp, have produced a form whieh I must 
consider, at least, as being sub-specific. To be sure, a few typical 
specimens do exist, but they are scattering, and I will venture to 
predict that in ten more years, it will be exceedingly difficult, if not 
impossible, to find a typical Strophia neglecta anywhere alive. In 
searching for typical S. neglecta on my last visit, I was very much 
surprised that I could not find it, seeing clearly that the specimens I 
was collecting were far from typical, but I was even more astonished 
when I came to compare the newly-gathered shells with those that had 
been lying in my cabinet for nine years, to note the difference. This 
difference I have tried to express both in the figures of the parent stock 
and in those of the sub-species, and in the description of them, but one 
must see the two forms together to thoroughly comprehend how 
marked these differences are. 
I -wish to be distinctly understood to say that I have never found 
a single example of what I consider as Strophia neglecta a hundred 
yards from the type locality, nor one of the sub-species elsewhere than 
in the sisal fields to the west of Nassau, or along the road that 
borders them, as given under the head of the smh-species. 
43 STROPHIA NEGLECTA AGAVA Novo. 
Agava Strophia, 
Tig. 48, A, front, B, side view, of type. 
DESCRIPTION. 
Sp. Ch. Size, rather above medium. Shell, thick and heavy,. 
Whirls, ten. Striations, present. Examined 500 specimens. 
Form of shell, a pointed cylinder, with the first two whirls- 
about equal in diameter, then the shell slopes gradually 4o a rather 
acute point, forming an angle of sixty-three degrees. Striations? 
rather numerous, twenty-four to the first whirl, they are rather 
