THE NAUTILUS. 



VOL xrx. 



FEBRUARY, 1906. 



No. 10. 



VITREA RHOADSI AND STJCCINEA RETUSA MAGISTER. 



BY HENRY A. PILSBRY. 



Illustrations of the two species named below have recently been 

 prepared for Mr. Bryant Walker's hand book 

 of the Mollusca of Michigan. We are in- 

 debted to Mr. Walker for the use of these 

 figures here, in advance of his own publi- 

 cation. 



VITREA RHOADSI Pils. Fig. 1. 



The figures represent one of the cotypes 

 from White Pond, Warren Co., N. J. (NAU- 

 TILUS, xii, 101). Mr. Walker has extended 

 the range by identifying the species from 

 Michigan, Ontario, Virginia, and other 

 places (NAUTILUS, xiv, 8). Specimens 

 have been sent from Buckfield, 

 Oxford Co., Maine, by Mr. 

 John A. Allen. 



SUCCINEA RETUSA MAGISTER 



Pils. Fig. 2. 



One of the cotypes from Rock 

 Island, 111., is here figured. This fine, 

 large form attains the size of S. concordialis. 

 The latter differs from it by having a very full, 

 sack-like base. Described in NAUTILUS, xii, 

 103. 



