452 NOTES ON INDIAN TERRITORY SHELLS. 



Zonites nitidus Miillcr. 



A specimen of this species, somewhat smaller than the type, was 

 found at Limestone Gap. 

 Zonites placentula Skuttlewortk. 



Fort Gibson, two or three shells. 



Zonites capsella Gould. 



A number of specimens were found at Limestoue Gap, which Messrs. 

 Dall and Stearns pronounce this species. The base is greatly flattened, 

 as well as the upper part of the last whorl, giving the aperture a re- 

 markably triangular form, quite different from any figures or specimens 

 of capsella I have seen. One or two specimens of the typical capsella, 

 were found with the above. 



Helix (Strobila) labyrinthica Say. 



Limestone Gap. 

 Pupa armifera Say, 



Eufaula. 

 Pupa rupicola Say. 



Fort Gibson. 

 Bulimulus dealbatus Say. 



Fort Gibson, on limestone mountains ; Limestone Gap. Abundant in 

 both localities. I have no hesitation in saying that I believe Bulimu- 

 lus dealbatus (&a,y)>J3. schiedeanus (Ph.), and var. Mooreanus (Pfr.), and 

 B. altematus (Say) are merely varying forms of one and the same 

 species. There is uot a character given in the figures or desciiptions 

 of these shells that holds good when an extensive series from differ- 

 ent localities is examined. I have before me several hundreds of speci- 

 mens from Tennessee, Indiau Territory, Kentucky, Texas, and Mexico, 

 and I know whereof I speak. Say states that "the labrum of alter- 

 natus is white within, with a perlaceous tinge." W. G. Binney says 

 that "the aperture is always dark; that it is readily distinguished 

 from the allied forms by its greater solidity, its highly polished sur- 

 face, its more elongated form, its dark-colored aperture bordered 

 with the white internal margin of the peristome, and the tooth like 

 callus upon the upper portion of the columella." (Manual of American 

 Laud Shells, page 37 L) In a suite of sixty specimens from Derby and 

 Laredo, Tex., there is a variation in the color of apertures and interiors 

 from creamy white throughout through shades of light and dark brown 

 to bluish black; there are shells with a greatly thickened rib on the 

 inner submargin, a character that gradually fades out until specimens 

 are found in which it is totally wanting; there is every possible varia- 

 tion of solidity, size, and form, as well as of comparative smoothness 

 of exterior. Some of these might be considered forms of dealbatus; 

 others perhaps would be referred to alternates or schiedeanus, but 

 many of them blend the characters of these so-called species in such a 



