﻿BARTSCH] \<h IS ON THE GENUS SONORELLA ' 



SONORELLA ROWELLI (Newcomb) 

 Helix rowelli Newcomb, Am. Journ. (Audi., vol. i. p. 346, 1865. (Nomcn 



nudum. ) 



1 rowelli Newcomb, Proc. Acad. Nat. Sci. Cala., vol. hi, p. 181, [866. 

 'Jaja rowellii Tryon, Am. Journ. Conch., vol. n. p. 316, [866. 

 Helix rowelli Cooper, Proc. Acad. Nat. Sci. Cala.. vol. in. p. 337, [867. 

 //,■//> ;v.\v/// W. G. Binney and T. Bland, Land and Fresh-water Shells 



\m.. pt. i. p. [85, fig. 326, 1869. 

 Helix rowelli Fischer and Crosse, Miss. Scient. Mex., vol. 1, pp. 252- 



253, 1870. 

 Helix rowelli Pilsbry, Man. Conch., vol. iv, p. 72, pi. 15 [fig- 12], 1888. 

 Helix rowelli Stearns, Proc. I'. S. Nat. Mus., vol. xvm, p. 207, [8 

 Helix rowelli E. vox Martens, Biol. Cent. Am., p. 1+4. 1901. 

 Helix rowelli Pilsbry, Man. Conch., vol. vm, p. 226, 1893. 

 Epiphragmophora rowelli Pilsbry, Man. Conch., vol. i\, p. 199, 1894. 

 Helix rowelli Dall, Proc. U. S. Nat. Mus., vol. xix, pp. 338-339, 1856. 

 Epiphragmophora rowelli Pilsbry and Johnson, Nautilus, vol. xi, p. 59, 



[897. 

 Helix rowelli Fischer and Crosse. Miss. Scient. Mex., vol. 11, p. 679. 



1900. 

 Sonorella rowelli Pilsbry, Proc. Acad. Nat. Sci. Phil'a, 1900, p. 560 



(1901). 

 Sonorella rowelli Pilshky. Nautilus, vol. xvi. p. 23. 1902. 



Sonorella rowelli is said to have been collected by Frick in Arizona. 



Dr. Dall (loc. cit.) gives the measurements of one of the specimens 



from the type lot as: maj. lat. 19 mm., min. lat. 14.5 mm., height 9 



mm. 



EXPLANATION OF PLATES 



(The illustrations accompanying this paper are after photographs made 



from the specimens by Mr. T. W. Smillie, Chief Photographer, U. S. National 



Museum.) 



Plate XXVIII 



Nuclear whorls of Sonorella wolcottiana Bartsch. enlarged about 21 diam- 

 eters. 



Plate XXIX 

 Nuclear whorls of Sonorella hachitana Dall, enlarged about 21 diameters. 



Plate XXX 

 Nuclear whorls of Sonorella fisheri Bartsch, enlarged about 21 diameters. 



Plate XXXI 

 (Three views are given of each species— dorsal, profile, and ventral. The 

 figures are natural size and the major latitude of the specimen figured follows 

 the reference in each case.) 



1. Sonorella dalli Bartsch; Type; 26.5 mm.; p. 193- 



2. Sonorella hachitana Dall; Type; 23.7 mm.; p. 193- 



3. Sonorella nelsoni Bartsch; Type; 25.5 mm.; p. 191. 



