192 BULLETIN OF THE, 
Pupa Pilsbryana, Srerkı. 
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 
strie which are more marked near the aperture. Whorls 44-54, moderately 
rounded with a rather deep suture, especially in the upper half, regularly and 
slowly increasing, the embryonal being relatively large, the last somewhat 
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. 0.8-0.9 mm. 
Pupa Pilsbryana, STERKI, The Nautilus, Vol. III. p. 123, March, 1890. 
There is a slight variation ; the example from New Mexico being of lesser diam- 
eter, 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, ete. group, and P. eurvidens, 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 does in hordeacella, and by the smooth surface. The fine bluish 
hue may also be a distinguishing character if it prove constant. 
The above is Sterki’s original description. 
g p 
Pupa calamitosa. 
Plate II. Fig. 1, 
See 3d Suppl., p. 219. A reduced copy of one of the original figures is given 
here. 
Pupa Hemphilli, Srerkı. 
In examining a lot of about forty-five specimens of Pupa calamitosa from the 
banks of San Tomas River, Lower California, I found there were two distinct 
forms in them. The author says, in his description of P. calamitosa: “ Several 
specimens have only one lamella on the outer lip, and are rather larger than the 
typical form described,” represented in Plate XII. Fig. 16 (loc. cit., No.7). Probably 
I had a greater number of examples at disposition than Mr. Pilsbry. The two 
forms proved to be distinct by an entirely different formation of the lamella, as 
