192 BULLETIN OF THE 



Pupa Pilsbryana, Sterki. 



Sliell 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 polislied, with few, irregular microscopic 

 striae which are more marked near the aperture. Whorls 4^5|, 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. Lamellae 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, Stkrki, The Nautilus, Vol. IIL 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, 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 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. 



Pupa calamitosa. 



Plate II. Fig. 1. 



See 3(1 Suppl., p. 219. A reduced copy of one of the original figures is given 

 here. 



Pupa Hemphilli, Sterki. 



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 



