﻿I96 SMITHSONIAN .MISCELLANEOUS COLLECTIONS [VOL. 47 



fleeted at the aperture, which is of medium size, very oblique, almost 

 circular and scarcely expanded. Columella only slightly expanded at 

 base ; parietal wall covered by a thin callus ; umbilicus moderately 

 wide and open to the apex. The type (No. 123.907, U. S. Nat. 

 Museum) was collected by Mr. Vernon Bailey on the Death Valley 

 expedition at Resting springs, Inyo county, California, among rocks 

 on a dry hill 900 ft. above the spring. The type measures: maj. lat. 

 15. 1 mm., min. lat. 13.2 mm., alt. 7.5 mm.; aperture: maj. lat. 6.6 

 mm., alt. y.2 mm.; umbilicus about 2 mm. 



SONORELLA BAILEYI ORCUTTI new subspecies 



(Plate XXXIII, figure 5) 



A lot of specimens collected by Mr. Orcutt in the Colorado desert 

 agree in nuclear character and in many other respects with S. baileyi, 

 but differ in the deflection of the aperture which is greater, and in 

 its shape which is more oval ; the umbilicus is also larger. This va- 

 riety may be called Sonorella baileyi orcutti. The type (No. 175,082, 

 U. S. Nat. Museum) measures: maj. lat. 16 mm., min. lat. 13.7 mm., 

 alt. 9.1 mm. ; aperture : maj. lat. 7 mm. ; alt. 6.8 mm. ; umbilicus about 

 3.5 mm. 



Group of 5\ magdalensis 



SONORELLA MAGDALENENSIS Stearns 



(Plate XXXIII, figure 2) 



Helix (Arionta) magdaleneusis Stearns. Proc. U. S. Nat. Mus., vol. 

 xiii, pp. 207^08, pi. xv, figs. 7, 11, 13 [not 12, which is 5". colora- 

 doensis Stearns]. 

 Helix magdaleneusis Pilsbry, Man. Conch., vol. vin, pp. 226-227, pi. lvi, 



figs. 4, s, 6, 1893. 

 Epiphragmophora magdaleneusis Pilsbry, Man. Conch., vol. ix, p. 199, 



1894. 

 Epiphragmophora magdaleneusis (in part) Dall, Proc. U. S. Nat. Mus., 



vol. xix, p. 339, 1896. 

 Epiphragmophora magdaleneusis (in part) Pilsbry and Johnson, Nauti- 

 lus, vol. xi, p. 59, 1897. 

 Helix magdaleneusis E. v. Martens, Biol. Cent. Am., pp. 144, 624, 1901. 

 Sonorella magdaleneusis Pilsbry, Proc. Acad. Nat. Sci. Phil'a, p. 560, 

 1901. 

 This species is the sole representative of this group in our collec- 

 tion, and the type and type lot are the only true S. magdalenensis, all 

 the other forms referred here belonging to different species. The 

 type was collected in the mountains above the town of Magdalena, 

 Sonora, Mexico, at an altitude of 1,000 ft. It measures: maj. lat. 

 12.3 mm., min. lat. 10.2 mm., alt. 6.5 mm. ; aperture: maj. lat. 6 mm., 

 alt. 5.5 mm.: umbilicus about 1.8 mm. 



