THE NAUTILUS. 53 
A NEW CALIFORNIAN MICRARIONTA. 
BY HENRY A. PILSBRY. 
MIcRARIONTA RIXFORDI N. sp. 
The shell is strongly depressed, umbilicate, the diameter of 
umbilicus contained about 5 times in that of the shell. Em- 
bryonic shell of 14 whorls at first densely pitted, the pitting 
rather irregular, passing into granulation, and on the last half 
whorl transformed into short strong wrinkles, roughly parallel 
to the suture and often anastomosing. Subsequent whorls are 
delicately marked with growth lines only, moderately convex, 
the last slowly and rather deeply descending to the aperture, 
rounded peripherally, and encircled with a brown band above 
the periphery. The aperture is strongly oblique, irregularly 
oval. The peristome is thin, basal margin narrowly expanded, 
columellar margin somewhat dilated, but covering only a very 
small part of the umbilicus. The parietal callus is very thin. 
Alt. 9.5; diam. 16.6 mm.; umbilicus 3.1 mm.; 42 whorls. 
This snail was received too late for illustration in the present 
number. It was collected by Dr. Emmet Rixford among rocks 
at the foot of the mountains on the southern edge of the Mojave 
Desert about 10 miles west of Twentynine Palms, Riverside 
Co., California. Type and two other specimens, No. 129781 
ASN. Sy P. 
Compared with M. indioensis (Yates), which is its nearest 
neighbor, this species is far more depressed and more openly 
umbilicate. M. desertorum Pils. & Ferr. and M. hutsoni Clapp 
are much smaller related forms from Arizona. 
The specimens were picked up dead and except for the 
shoulder band, show no color. 
A NEW CHINESE CLAUSILIA. 
BY H. A. PILSBRY. 
CLAUSILIA (EUPHAEDUSA) STEETZNERI N. 8. 
The shell is very slender, slowly tapering, the outlines of the 
spire straight, very slightly concave near the summit; opaque, 
