﻿BARTSCH] NOTES ON CHE GENUS SONORELLA 195 



low than above, with the periphery of the last whorl somewhat sub- 

 angulate. The entire surface of this portion is marked by quite 

 prominent incremental lines and numerous very fine and closely 

 placed granulations. The last whorl is considerably deflected at the 

 aperture, which is very oblique, suboval, and bul slightly expanded. 

 Columella rather broad, expanded at base and partly reflected over 

 the rather narrow umbilicus. The type (No. [30,003, U. S. Nat. 

 Museum) and three additional specimens were collected by Major 

 E. \. Mearns, U. S. A., in the San Jose mountains, Sonora, Mexico, 

 about four miles south of the Arizona boundary and a few miles east 

 of San Pedro river. The type measures: maj. lat. [6 mm., min. 

 lat. 13 mm., alt. 8 mm.; aperture: maj. lat. 8.4 min., alt. 7.3 mm.; 

 umbilicus ah< iut 2 mm. 



SONORELLA BAILEYI new species 

 (Plate XXXIII, figure 4) 



Epiphragmophora magdalenensis (in part) Dall, Proc. U. S. Nat. Mu- 

 seum, vol. xix, p. 339. 



Epiphragmophora magdalenensis (in part) Pilsbrv and Johnson, Nauti- 

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



This is the smallest member of the group, approaching .S'. fisheri 

 in size. Shell rather depressed; general coloration light flesh 

 color with a moderately broad pale brown band encircling the 

 whorls a little above the periphery. This band is only partly 

 visible above the suture, above the last volution. The nepionic 

 stage is rather small, embracing only about one-fourth of a turn ; it 

 is sparingly marked with transverse wrinkles. The neanic portion 

 consists of one and one-half volutions, which are ornamented by in- 

 cremental lines upon which are placed the characteristic sculpture of 

 the section, the lines seeming to consist of fused attenuated papillae. 

 This species therefore shows a tendency toward the group of 5\ zvol- 

 cottiana. Ephebic whorls a little more than three, moderately 

 rounded, less so between the sutures than on the base, marked by 

 many incremental lines, and somewhat distant regularly disposed 

 rows of small oval papilla; which have an arrangement similar to 

 that found on the neanic portion of the S. wolcottiana group, i. e., 

 alternate series fall in the same spiral plane and this lends the whorl 

 the appearance of being crossed by interrupted curved lines of papillae 

 passing from the summit of the whorls very obliquely forward and 

 downward to the suture. These papillae are best developed between 

 the sutures on the early whorls ; they appear to become gradually lost 

 on the last half of the last whorl. The last whorl is moderately de- 



