94 THE NAUTILUS. 



A NEW BISSOA FROM CALIFORNIA 



BY W. H. DALL AND PAUL BARTSCH. 



Rissoa keheyi Dall and Bartsch. 



Shell of medium size, elongate-conic, white, variously banded, or 

 uniformly chocolate brown. Nuclear whorls mammillate, smooth. 

 Post- nuclear whorls slightly rounded, ornamented axially by a few 

 broad, depressed, almost obsolete ribs which are best seen near the 

 summit of the whorls, and many irregular, more or less deeply im- 

 pressed striations, which extended almost undiminished to the um- 

 bilical region. The spiral sculpture however is more conspicuous 

 than the axial, and consists of deeply impressed lines which are 

 more closely placed and less strongly developed near the summit of 

 the whorls than at the periphery, grading gradually in this respect 

 between these two regions. Sutures simple, well marked. Per- 

 iphery and base of the last whorl well rounded, the latter ornamented 

 by spiral sculpture similar to that between the sutures, but a little 

 more distantly spaced and more strongly impressed. Eighteen of 

 the spiral lines appear between the sutures upon the penult whorl 

 and ten upon the base. Aperture large, oblique, decidedly effuse 

 anteriorly ; posterior angle acute, peristome continuous ; columella 

 strong, short, somewhat twisted and slightly revolute. 



The type has seven post-nuclear whorls and measures: long. 6.3 

 mm., diam. 2.5 mm. 



Seven specimens were sent to the National Museum by Mr. F. 

 W. Kelsey, who collected them at Pacific Beach, California. The 

 type and two specimens now form no. 168605 of the U. S. N. M. 

 collection, the remaining four being in Mr. Kelsey's collection. 



This species appears to be nearest related to Rissoa albolirata 

 Carpenter, but is larger in every way than that form ; there are also 

 minor differences in sculpture. 



VITREA DRAPARNALDI, BECK., IN WASHINGTON, D. C. 



BY GEORGE AV. II. SOELNER. 



On the 22d of May, 1901, I visited a greenhouse in this city for 

 the purpose of investigating its snail life, and was rewarded by find- 

 ing a colony of what I at that time firmly believed to be finely de- 



