1889.] NATURAL SCIENCES OF PHILADELPHIA. 415 



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 ; peristome moderately reflected ; 

 lamella? 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 about its middle ; the upper 

 short, rather high on the callous ; above the upper one a supra- 

 palatal, quite small, dentiform, nearer the margin. 

 Length 1*7 mill., diam. 0*8 mill. 



In the spring of 1887, Mr. John A. Holzinger, of Winona, Minn., 

 sent me a lot of small Pupae, among which there was one specimen 

 of a new species. It was a dead, weather-beaten, poor shell, but 

 evidently adult. By repeated, ever so careful examinations it broke 

 to pieces, but not before I had made a drawing and description of 

 it. Mr. Holzinger as w T ell as a few of his students then endeavored 

 to secure more specimens, but all their efforts have been in vain, so 

 far. In 1888, in a vial of Pupa from northern Illinois sent by 

 Mr. Win. A. Marsh, I found a few more specimens of evidently the 

 same species, the shells fresh and good. This year, at last, among a 

 number of small Pupa collected at Davenport, la., I was fortunate 

 in detecting three more examples. The validity of the species was, 

 consequently, established ; and on the other hand it proved to be a 

 Form quite distinct, and readily separable from all other species. 



It is a most interesting and valuable addition to our malacological 

 fauna as it belongs to a specifically American group, 1 viz. : that of 

 P. armifera and P. contracta Say ; but it is much smaller than the 

 latter of the two named as this is than the former. Yet the three 

 together form a well characterized and well-defined group of 

 evidently common origin, and it may be possible sometime, and 

 would be an interesting task of paleontology, to detect a fossil form, 

 or forms, from which the recent ones are derived. 



1 It is possible and even probable, however, that certain species of Pupa 

 described from eastern Asia range among the same group ; yet as I have seen no 

 specimens and know them only from the descriptions, I am unable to judge of 

 them. 



