258 PROCEEDINGS OF THE CALIFORNIA 



Regular Meeting, March 19th, 1866. 

 President in the Chair. 



Twelve members present. 



Donations to the Cabinet : Sections of the Sequoia gigantea and 

 a roll showing the annual growth of the " Old Maid," one of the 

 trees in the Calaveras grove of Big Trees ; from Mr. Henry 

 Hentsch. 



Mr. Dall stated that Dr. Cooper had discovered, in the vicinity 

 of Santa Cruz, Helix redemita, H. Vancouverensis, H. Columbiana, 

 and H. arrosa ; also, in the small rivulets near the town, Marga- 

 ritana falcata, besides several univalves, and also an undetermined 

 Helix, which may prove to be new. Mr. Dall also remarked that 

 Rev. J. Rowell had obtained at Hayward's, Alameda County, a 

 number of specimens of Helix CronJchitei, which is a new locality 

 for that species. 



Mr. Dall remarked that in dissecting a specimen of Trochiscus 

 Nbrrissii, the position of which has for some time been doubtful, 

 sufficient evidence was obtained to decide that it did not belong 

 with the Proboscidians, to which group it had been doubtfully 

 referred by several naturalists. 



Regular Meeting, April 2d, 1866. 

 Mr. Stearns in the Chair. 



Five members present. 



Mr. Bloomer presented some Diatoms, from the coast of Cali- 

 fornia, supposed to belong to the genera 31elissa and Meridion; 

 they were both found growing upon calcareous sea weeds. The 

 genus Meridion has not heretofore been recorded as occurring in 

 California^ 



Mr. Dall presented, in the name of Dr. Cooper, the following 

 paper : 



