124 THE NAUTILUS. 
for which I propose that of Mr. Pilsbry, the active student of our 
Pupidee, to whom I am indebted for a number of valuable specimens 
and facilities to examine such. 
Description: Shell minute, narrowly perforate, cylindrical-oblong 
to cylindrical, somewhat attenuated towards the rather blunt apex, 
colorless (when fresh glassy) with a very delicate bluish tint, smooth 
and polished, with few, irregular, microscopic strize which are more 
marked near the aperture. Whorls 43-53 moderately rounded with 
a rather deep suture especially in the upper half, regularly and 
slowly increasing, the embryonal being relatively large, the last some- 
what ascending toward the aperture; the latter of moderate size, 
lateral, subovate, margins approached, peristome somewhat expanded 
without a thickened lip or a callus in the palatal wall; outside is a 
barely perceptible trace of a crest near the margin and behind that a 
slight impression most marked upon the inferior palatal fold. 
Lamelle 4 or 5; one apertural, rather high of moderate length, 
simple; one columellar, horizontal, of moderate size, simple ; basal 
very small or wanting; palatals the typical, inferior deeper seated, 
of moderate size, superior small or very small. 
Alt. 1.5-1.7 ; diam. 0.8-0.9mm. 
There is a slight variation ; the example from New Mexico being 
of lesser diameter, and having no trace of a basal lamella. 
The soft parts have not been seen so far, but will be of high interest, 
since, to judge from the shell, our species seems to be an intermediate 
form between the hordeacella, etc., group, and P. curvidens, especially 
its var. gracilis. 
P. Pilsbryana has much resemblance in shape and size to small, 
albino examples of P. hordeacella Pilsb., but, under a glass, is at once 
distinguished by the shorter, simple apertural lamella not ending at 
or very near the upper termination of the palatal margin, as it 
is in hordeacella, and by the smooth surface; the fine bluish hue 
may also be a distinguishing character if it prove constant. 
Vertigo (?) variolosa Gould. 
So far as I know, no specimen of this species from the continent 
is existing now in collections, that or those in the B. & B. collection 
having been lost sometime; but in the same, among a number of P. 
contracta Say, from Jamaica, one has been detected lately. Mr. 
Henry Moores of Columbus, Ohio, has had one example from Cuba, 
collected some 35 years ago by John Bartlett, and he was kind enough 
tolenditto me. Itis more conical than in the figure and there are two 
