Regular Meeting, April 2d, 1866.
Mr. Stearns in the Chair.
Five members present.
Mr. Bloomer presented some Diatoms, from the coast of California, supposed to belong to the genera Melissa 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: