﻿\i HI'S ( >N THE GENUS S< >N< )RELLA., WITH DESCRIP 

 TI< >NS OF NEW SPECIES 



By PAUL BARTSCH 



In the Proceedings of the Academy of Natural Sciences of Phila- 

 delphia for 1900 [1901], pp. 556-560, Dr. II. A. Pilsbry defined thi 

 genus Sonorella and referred to it the following species: Epiphrag- 

 mophora hachitana Dall, Helix (Arionta) magdalenensis Stearns. 

 Helix {Arionta) eolorado'ensis Stearns, Epiphragmophora ariao- 

 nensis Dall, Helix rowelli Newcomb, Helix [Arionta) carpenteri 

 Newcomb variety indioensis \ "ates. Helix lohrii Gabb, and probably 

 Helix carpenteri Newcomb. 1 Since then Sonorella gramdatissima 

 Pilsbry and 5. wolcottiana Bartsch have been described. 



The shells of the various species of Sonorella bear close resem- 

 blance to each other, with perhaps the exception of S. dalli n. sp. 

 and S. lohrii Gabb. The ephebic portion of all is polished, marked 

 by lines of growth and in some of the species by raised papillae — never 

 by incised spiral lines. A careful examination of the nuclear whorls 

 shows variations along several lines, and these variations may be 

 utilized in grouping the species. The first or nepionic stage is always 

 small, embracing only a fraction of a turn ; it appears to be similar in 

 all the species, varying only slightly in extent and in the strength of 

 the transverse wrinkles which constitute its sole sculpture. It is in 

 the second or neanic stage that we find variations. These may be 

 defined as follows : 



/. — Group of S. wolcottiana 

 (Plate XXVIII) 

 In this group there are many narrow', low, raised lines or wrinkles 

 which coincide with the lines of growth ; and in addition to these there 

 are numerous prominent, distinct, elongate-oval papilla?, the long axis 

 of which is at a right angle to the lines of growth. These papillae 

 are so arranged that alternate series fall in the same spiral line, i. e.. 

 the papillae of each succeeding series point toward the middle of the 

 space between the papillae of the series preceding, the complete effect 

 being interrupted papillose lines which extend from the summit of the 

 whorls obliquely forward and downward toward the suture. 



1 Epiphragmophora carpenteri Newcomb is not a Sonorella; incised spiral 

 lines are never present in this genus. 



187 



