1903.] NATURAL SCIENCES OF PHILADELPHIA. 211 



SO labelled, presumably from the original lot, are in the collection of 

 the Academy, given by Gould. 



The species differs from V. significans chiefly in the different contour 

 of the adult shell; from V . placentula in the smaller size of the adults. 

 The shell measures from 5 to nearly 6 mm. in diam., and has 6 to 7 

 whorls. Rarely, a young indi\ddual may be found with a pair or two of 

 internal teeth (PL XI, fig. 3, diam. 2 mm.), recalling the ancestral den- 

 tate stock; but this stage is now passed through at an early age, or 

 entirely skipped ; and in the series I have examined, from southwestern 

 Virginia, Kentucky, Tennessee and Alabama, toothed individuals are 

 very unusual. 



V. capsella is not known from west of the Mississippi depression, 

 being represented there by the very closely related T'. significaiis and 

 V. simpsoni. The figures represent specimens from Woodvilie, Ala., 

 collected by ^Ir. H. E. Sargent. 



Vitrea placentula and significans might, with no great violence, be 

 subordinated to capsella as subspecies. 



Vitrea capsella lacteodens n. v. PL XI, figs. 5, 5a. 



Hyalina significans Bid., Harper, Journ. Cincinnati Society of Natxiral 



History, IV, 1881, p. 258, figs. 2, 2a. 

 Zonites significans Bid., Wetherby, Journ. Cin. Soc. N. H., IV, December, 



1881, p. 328, No. 25. W. G. Binney, Man. Amer. Land Shells, p. 228, 



fig. 250 (exclusive of quotation from Bland, etc.). Sterki, Nautilus, 



VII, pp. 16, 17 (1893). 

 Gastrodonta significans Bid., Pilsbrv, Moll, of the Great Smoky Mts., Proc. 



Acad. Nat. Sci. Phila., 1900, p. 147. 

 Vitrea capsella, specimens from Tuskeegee Mountain, Graham county, 



N. C, Pilsbry, t. c, p. 140. 



Type specimens from "Ramp Cove," Tuskeegee Mountain, N. C, 

 taken by James H. Ferriss and H. E. Sargent, 1899. 



The shell is similar to V. capsella, except that most specimens have 

 one to three pairs of tubercular teeth within the last whorl. The 

 sutures are a trifle less impressed, and the striation perceptibly closer. 

 It differs from V. significans in the usual persistence of the teeth in 

 the adult stage, and the median position of the periphery. In fuUy 

 adult significans the periphery is subbasal, and there are no teeth. 



Alt. 2.6, diam. 5 mm.; whorls 6^. 



This particular race occurs, so far as I know, only in the mountains 

 of southwestern North Carohna. It is not separable from T". capsella 

 by any hard-and-fast character, but merely by the persistence of the 

 pairs of teeth in most adult shells of any given lot. Thus in the type 

 lot, collected by Mr. Sargent on Tuskeegee Mountain, Graham county, 

 N. C, one adult out of thirteen before me is quite toothless, and by 



