298 PROCEEDINGS OF THE ACADEMY OF |[Nov.—Dec., 
As the error in measuring may be at least 0.1 mm., it will be seen, 
if a curve is plotted, that the mode for diameter is at about 24.4 mm., 
and the total variation 2.1 mm. in either direction. 
A specimen having the umbilicus exceptionally narrow is illustrated 
in pl. 4, figs. 8-8b. The spire is also narrower than in the typical 
form; yet it seems unlikely that there is more than one species in the lot. 
Sonorella galiurensis n. sp. Pl. V, figs. 5 to 6b. 
The shell is umbilicate (the width of umbilicus contained about 
9 times in that of the shell), between cinnamon-brown and sayal- 
brown in color, fading on the base, and much paler on both sides of 
the broad chestnut-brown band above the periphery. Glossy; em- 
bryonic whorls closely pitted-granulate, with the usual protractive 
threads; subsequent whorls lightly marked with irregular growth- 
lines. The last whorl is wide and descends somewhat in front. The 
peristome is narrowly expanded. The parietal callus usually has a 
thickened edge in fully adult shells. 
Alt. 16.7, diam. 27.5 mm.; 5 whorls. (type, Sta. 30). 
4G, ehs DTN ae Bid Ue Stas SO: 
AGA FO Bil oes oie Ea Stara 
mes Toy coe sacs 0 Ae eee FE (Se og 
Galiuro Mountains at the following Stations (1917): 
Fig. 7. Genitalia of Sonorella galiwrensis, No. 118,122. 
Oe a, 
