98 THE NAUTILUS. 



SoNORELLA LOHRii (Gabb). PI. 2, fig. 8. 



Helix lohrii Gabb. American Journal of Conchology, III, p. 

 236, pi. 16, fig. 2 (1867) ; IV, p. 235 (1868). 



Sonorella lohrii Gabb, Pilsbry, Proc. A. N. S. Phila. 1900, 

 p. 560 (1901). Bartsch, Smiths. Misc. Coll., vol. 47, p. 197, 

 pi. 32, fig. 1 (1904). 



Helix sieganella Mabille, 1895. See below. 



The prominent features of this species are the very minutely 

 granulated surface, the large nuclear whorl and small number 

 of whorls, the position of the periphery, which is above the 

 middle, very obtusely angular in front, the surface below it 

 being rather flattened and sloping inward. The peristome is 

 somewhat bell-shaped, flaring, reflexed outwardly and below. 

 The type (No. 58106 A. N. S. P.) measures, height 10, diam. 

 22.1 mm. ; width of umbilicus 4 mm. ; width of aperture 13, 

 height 11.1 mm. 



Dr. Bartsch has given excellent figures of this species, but 

 for read}^ comparison with the others I have figured the type 

 specimen here. 



S. lohrii Gomes "from the higher table lands near Moleje." 



Sonorella lioderma Pilsbry. PI. 2, fig. 7. 



Sonorella lohrii lioderma Pils., Nautilus XVIII, p. 59 (1904). 



The shell is depressed with very low spire and broadly open 

 umbilicus, contained about five times in the diameter of the 

 shell ; very glossy, smooth except for fine growth-lines ; whorls 

 4^, convex, slowly increasing to the last which widens rapidly, 

 is rounded at the periphery, and descends rather deeply in front. 

 The aperture is strongly oblique, transversely ovate. Peristome 

 expanded and reflexed throughout, the margins strongly con- 

 verging and joined by a thin, short parietal callous, the colum- 

 ellar margin dilated, overhanging a small part of the umbilicus. 

 Height 10, diam. 21.8 mm. ; width of umbilicus 4.2 mm. ; 

 aperture 13.3 mm. wide, 11.1 high (including peristome). 



This shell was originally described as a subspecies of S. lohrii, 

 but it is evidently distinct. It differs by the entire absence of 

 granulation, the equally rounded periphery, less deeply im- 



