76 
THE NAUTILUS. 
seems, from my own investigations, to be very accurate. I venture, 
however, to supplement the same with a species hitherto unrecorded 
amongst the annals of the mollusk fauna of Long Island, and exist¬ 
ing in what I believe to be a very circumscribed area. Most of the 
species Mr. Prime records I have found in localities other than those 
he names, and from his more extended investigations and those of 
his predecessors, Messrs. Temple Prime and Sanderson Smith— 
ranging over nearly the entire island—I am inclined to believe that 
the species of which I am about to write is to be found in but one 
locality, the one in -which it was first discovered. 
During the early spring of 1891 a colony of Stenotrema hirsuta 
was accidentally discovered by my friend, the late Mr. James Arm¬ 
strong, a naturalist residing in Bay Ridge, L. I.; they were found in 
a small patch of woods, or rather, a small thicket, laying at right 
angles to a good-sized wood, at what is now 13th Ave. and 74th St., 
Brooklyn. The situation was a good one, being shady, and the 
ground covered with small fragments of boulders cast there at some 
past time from the surrounding fields. It had been undisturbed 
for years, as the position of the stones testified to; the leaves of 
many summers had fallen, decayed, and left their remains amongst 
the interstices in the form of a rich, dark mould. 
The surrounding woods, for there are (or were) several in this 
immediate vicinity, had been thoroughly searched, both by myself 
and Mr. Armstrong, for many previous years, with a view of col¬ 
lecting specimens of the land mollusca, and had yielded to active 
and close search examples of Helix ( Mesodon ) cilbolabris and 
thyroicles, Zonites arboreas and indentatus, Helieodiscus lineatus> 
Strobila labyrinthica, Vertigo JBollesiaua and milium, but never a 
trace of the Triodopsis or Stenotrema groups, which, moreover, had 
never been noticed before by either of us in Long Island. Steno¬ 
trema hirsuta is at all times a rare shell in this part of the country. 
I know but of one specimen, collected at Highbridge, N. Y. City, 
and have heard of a few specimens being found on Staten Island 
by the late Dr. Hibbard, on the palisades of New Jersey. I have 
found them, but even there they are exceedingly scarce. 
Now in this particular locality they abounded, and a very large 
quantity of specimens was procured. 
The question arises how or by what means were they introduced. 
Evidently they were not the survivors of a species that had once 
flourished there, as in that case at least dead shells would have 
