212 PROCEEDINGS OF THE ACADEMY OF [Feb., 



itself would be called capsella. Some others have only one or two 

 teeth remaining. It is the general character of the specimens from 

 any one place, not the particular condition of each individual, that 

 must be considered. 



Harper, Wetherby, W. G. Binney and Sterki have mistaken this 

 race for the Western V. significans, and I formerly followed this 

 erroneous identification. 

 Vitrea significans (Bid.)- PI- XI, figs, 7, 7a, lb, s, sa. 



Helix significans Bid., Amer. Journ. of Conch., II, p. 372, PL 21, fig. 9 (not 

 good). 



Zonites significans Bid., Binney, op. plur., exclusive of East Tennessee form. 



Range: Originally described from Fort Gibson, Indian Territory, 

 this species has been taken to my knowledge in Arkansas, at Mabelvale 

 (C. W. Johnson^^), and in southwestern Missouri, at Seligman, Barry 

 county (Ferriss, 1901). 



As Bland stated in his original description, the young shells are 

 sometimes provided with one or two pairs of tubercular teeth within, 

 visible through the base of the shell as white spots. The full-grown 

 shells are toothless, more or less dome-shaped, the periphery being 

 situated below the middle of the last whorl, the circumference of 

 which is flattened and sloping. The base is very concave in the 

 middle. This gives the shell a peculiar and uniisual contour. Half- 

 grown and young individuals are normal in shape, and very similar to 

 V. capsella and its variety lacteodens, from which, indeed, it would be 

 almost impossible to separate them except by the locality. The spire, 

 seen from above, is about the same in capsella, placentula and signifi- 

 cans. Figs. 7, 7a, 7b represent fully adult specimens of the typical 

 form from Seligman, Barry county. Mo., collected by Mr. Ferriss; 

 figs. 8, 8a are immature sheUs from the same place and lot. 

 Vitrea simpsoni (Pilsbry). PL XI, figs. G, 6a, 6b. 



Zonites capsella Gld., Simpson, Proc. U. S. Nat. Mus. for 1888, p. 452. 

 Zonites simpsoni Pils., These Proceedings for 1889, p. 412, PI. 12, figs. 8-10. 

 Vitrea simpsoni Pils., These Proceedings for 1900, p. 456; Ferriss, Nautilus, 

 XIV, pp. 30, 31. 



Range : Western Arkansas and Indian Territory ; Mena and Hatton's 

 Gap, Polk county, in western, Morris Ferry, Little River county, 

 southwestern Arkansas (J. H. Ferriss); Limestone Gap, I. T. (C. T. 

 Simpson). 



This species is more depressed than significans or capsella, with the 

 last whorl decidedly wider, when viewed from above. It has not j^et 



'^ Reported in the Catalogue of Land Shells, 1898, p. 26, under T'. simpsoni, 

 No. 275. 



