34 PROCEEDINGS OF THE ACADEMY OF [1890. 



straight palatal wall and margin, so that, indeed, the shell appears 

 to be immature. But when seen under a glass of sufficient power, 

 the margin is completed and, as already mentioned, there is a thin 

 callus at a little distance from the margin. Moreover, Mr. Webster 

 wrote me that of more than 150 examples he had seen, all were alike. 



A few days ago, in a lot of P. corticaria Say, from Ithaca, N. 

 Y., sent from Texas, there was one example of this species, the shell 

 dead but in fair condition, a little larger and less fragile than the 

 Florida examples, and with a well marked callus corresponding to 

 a slight but distinct crest. The specimen may have been collected 

 in New York, and from its appearance at least I would ascribe to it 

 an origin north of Florida.^ 



By the kindness of Mr Webster I was enabled to see a living ex- 

 ample. The foot and the lower parts of the head are nearly color- 

 less ; head, eye-tentacles and neck light gray. Jaw very tender, thin, 

 pale yellow, consisting of about 14 longitudinal plates, shorter and 

 wider in the middle, longer and narrower toward either end ; it is 

 much like that of V. tridentata, Wolf. Odontophore about 0'36 mm. 

 long, 0*1 wide, about 110 square rows in each f+f+f teeth ; central 

 very small ; laterals gradually passing into marginals ; the latter 

 serrate. Different from that of V. tridentata. 

 Vertigo rugosula, sp. nov. 



Related to V. ovata and gouldii ; in shape more elongated than 

 the latter, more cylindrical and somewhat larger. Apertural parts 

 and lamellae much like those of ovata, but the columella is decided- 

 ly longer and straighter, and the inferior columellar lamella is 

 distinctly placed on it. L. l-8-2'0 D. 1*1 mm. Of a peculiar forma- 

 tion is the surface : of the 5 well rounded whorls, about one and 

 a half of the upper are nearly smooth ; the following with exception 

 of the last are distinctively and regularly striated, the last very finely 

 but distinctly rugose in the sense of the lines of growth, near the 

 aperture again striated. Color, dark chestnut. 



This is a beautiful species, of which I saw the first example in the 

 collection of Mr. Bryant Walker, who had found it, in April last, at 

 Pass Christian, Mississii^pi. Last September, Mr. W. G. Mazyck 

 collected a number of them on Sullivan's Island, S. C. In either 

 place they were in company of Pupa rupicola Say. Quite lately I 

 have seen one example from Lee Co., Texas, sent by Mr. J. A. Sing- 



1 Since the above was written, I found a few examples in drift froip Guadalupe 

 River, Texas, collected by Mr. J. A. Singley, sent by Mr. Wm. A Marsh. 



