MUSEUM OF COMPARATIVE ZOOLOGY. 193 



Habitat. — Under loose oak bark, oak hamak, Archer, Alachua County, Florida, 

 April, 1885, W. H. Dall, sixteen specimens. 



This is one of our smallest species, and is related to P. pentodon and P. pellucida. 

 It is about half the size of the former and much more slender. Its teeth recall 

 those of P. curvidens, Gould, in their arrangement, but the shell is more cylindrical 

 and smaller than it is in P. pellucida (servilis) as figured by Gould. The teeth are 

 more numerous than in the latter shell, and set, as in P. pentodon, in one series ; 

 not, as in pellucida, partly deeper in the throat. 



I describe this with some hesitation, for the condition in which the Pupidae and 

 Vertigos of North America are is most unsatisfactory, and offers an excellent field 

 to some careful student who shall be able to examine and figure large series of 

 authentic specimens. Still, as there is absolutely no other form with which I feel 

 able to unite this one, it is better to give it a name than to leave it erroneously 

 with some other species. 



The above description is copied from that of Dall, while the figure, Plate 

 XVII. Fig. 11, is copied in my Plate III. Fig. 2. I have seen no specimen of it. 



Pupa fallax, Say. 



armifera, Say. 

 contracta, Say. 



Pupa Holzingeri, Sterki. 



Shell narrowly perforated, turrited-cylindrical, vitreous (or whitish), very 

 minutely striate, shining ; apex rather pointed ; whorls 5, regularly increasing, 

 well rounded, especially the upper ones, the last somewhat narrowed and a 

 little ascending towards the aperture, compressed at the base but not carinated, 

 at some distance from the outer margin provided with an oblique, rather prom- 

 inent, acute crest corresponding in direction to the lines of growth, extending 

 from the base to the suture, formed by a whitish callosity; behind the crest the 

 whorl is flattened, and corresponding to the lower palatal lamella, impressed ; 

 aperture lateral, scarcely oblique, relatively small, inverted subovate, with a 

 slight sinus at the upper part of the outer wall, margins approximated ; peri- 

 stome moderately reflected; lamellae 6; one parietal, rather long, very high, in 

 its middle part curved outward, towards the aperture bifurcated, the outer 

 branch reaching the parietal wall ; one columellar, longitudinal, rather high, 

 its upper end turning in nearly a right angle towards the aperture, but not 

 reaching the margin ; basal exactly at the base, short, high, dentiform ; 3 in 

 the outer wall, viz. : the lower palatal long, ending in the callus, highest at 

 about its middle ; the upper short, rather high on the callus ; above the upper, 

 one supra-palatal, quite small, dentiform, nearer the margin. 



Length 1.7 mm., diam. 0.8 mm. = .068 X -032 inch. 



As already stated, our species ranges beside P. armifera and P. contracta, 

 Say, standing nearer the latter. Yet it is different from this species by the 

 shape of the aperture, the wanting callus 1 connecting the margins on the 



1 In many specimens of P. contracta so strongly developed that the peristome is 

 rendered continuous. 



vol. xix. — no. 4. 13 



