THE NAUTILUS. 



You XVIT. DECEMBER, 19O3. No. 8. 



A NEW CALIFORNIAN TRIVIA. 



BY WILLIAM .1. RAYMOND. 



During the summer of 1901 the University of California, with the 

 financial aid of friends in Los Angeles, maintained a Marine Bio- 

 logical Laboratory at San Pedro, California, and carried on biolog- 

 ical exploration along the coast from Redondo to Newport, around 

 Catalina Island, and from Los Coronados Islands to La Jolla in the 

 vicinity of San Diego. The large gasoline launch "Elsie" was 

 chartered for the summer and equipped with apparatus for the study 

 of the physical environment of marine life, including depth, temper- 

 ature and salinity of water and character of bottom. Collections of 

 specimens were made within the regions named, from shore-line to 

 an extreme depth of 100 fathoms. For this purpose the launch was 

 provided with a winch and rope, dredges, trawls, tow-nets and re- 

 ceptacles for the preservation of the specimens. The molluscan col- 

 lections, which were large and interesting, were placed in the writer's 

 hands for identification and report. In advance of a complete report 

 it is desirable to put certain observations on record, among them the 

 descriptions of new species encountered. A previously known but. 

 undescribed species of Trivia is : 



Trivia ritteri n. sp. Shell small, white, form ovate, inflated, 

 anterior extremity slightly produced, spire completely covered, but 

 rather prominent, base convex, outer lip margined, strongly sculp- 

 tured with about twenty, smooth, sharp ribs, much narrower than the 

 interspaces which are nearly flat and scarcely roughened by irregular 

 rugae parallel to the axis of the shell, no sulcus, the ribs continuing 



