THE NAUTILUS. 53 



A NEW CALIFORNIA!! MICRARIONTA. 



BY HEJSRY 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 1^ 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.; 4f 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 

 A. N. S. 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. s. 



The shell is very slender, slowly tapering, the outlines of the 

 spire straight, very slightly concave near the summit; opaque, 



