f • ^^I'sui!^'] PROCEEDINGS OF THE NATIONAL MUSEUM. 97 



Piiebla, in the province of Puebla, Mexico, were presented to the 

 National Museum by the Mexican Geographical Commission a few 

 years ago. The presence of these two forms most certainly suggests 

 the (]uestion as to whether they were not introduced by the Spaniards 

 many years, centuries ago, either for food purposes or incidentally in 

 the routine and accidents of commercial intercourse. 



Helix (Arionta) coloradoensis Stearns. 



Grand Canon of tlio Colorado, opposite the Kabab Plateau, at an elevation of 3,500 

 feet (Mu8. No. 101100). Dr. C. Hart Merriam. 



Described in the Proceedings of the U. S. National Museum, vol. xiii, 

 p. liOO, Pigs. C, 7, 8, PI. XV. 



Helix (Arionta) magdalenensis Stearns. 



H Magdalena, State of Sonora, Mexico, on the line of the Sonora, New Mexico and Arizona 

 Kailroad, at an elevation of 1,000 feet above the town (Mus. No. 104094) ; Vernon 

 Bailey. 



Described in the Proceedings of the U. S. National Museum, vol. xiii, 

 p. 207-208, Figs. 11, 12, 13, PI. XV. 



Buliniulus dealbatus Say. 



Texas, near Sanderson (Mus. No. 118365) ; also from near Eagle Pass (Mas. No. 120345). 

 William Lloyd. 



Three examples of a small variety of this form, of which one indi- 

 vidual, in the prominence of its incremental lines, indicates the relation- 

 ship of Mr. Pilsbry's B. ragsdalei. The foregoing ap[)lies equally well 

 to the Eagle Pass examples, six in number. The Sanderson specimens 

 are of a dead, chalky whiteness; the Eagle Pass lot are marked more 

 or less with irregular blotchy stripes of a pale corneous brown color. 



Buliinulus dealbatus Say ; var. — B. ragsdalei Pilsbr3\ 



Comstock, Texas, William Lloyd (Mus. No. 118402) ; Laugtry, in the same State, 

 Vernon Bailey (Mus. No. 118367). 



Four specimens of this variety of dealbatus were collected at the first- 

 named locality. These differ from Mr. Pilsbry's shells only in the 

 matter of color, the examples before me being of an opacpie white, with 

 an occasional pale brownish longitudinal streak. The largest individ- 

 ual shows considerable angulation on the basal whorl just below and 

 following the suture, and there is considerable variation in robustness. 

 The longitudinal ribs consist of more or less strongly developed growth 

 lines, which are distinct and definite throughout and over the entire 

 shell in Mr. Lloyd's specimens ; more conspicuous in the largest example, 

 which is the one above referred to as showing angulation. The author 

 says of B. ragsdalei, " that no specimens showing a transition to B. deal- 

 Proc. N. M. 01 7 



