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:
Description of a new California Helix, with notes on others already described.
BY J. G. COOPER, M.D.
Helix (Arianta) sequoicola, Cooper.
Sp. Ch. H. testa rotundata, umbilicata, spira depressa, anfr. ult. nonnunquam subangulata; anfr. vi ad vii et dimidium, perist. obliqua superne parum deflecta; labio tenui, reflexo, infra crassiore, acuta. Colore atrobrunnea, vel olivacea, zona nigra, lata, inter duabus ochraceis sita, in spira semicelata, labio albo; intus læte purpureo, zonis duabus albis. Epidermide nitente, infra polita, striis incrementis læve perspicuis, interdum tenuissime malleata, rugis spiralibus; supra punctis piliferis creberrime induta; pilis brevissimis junioris deciduis.
Animal schisto-colore; corpore cylindraceo rugosa, tentaculis longis, pede postice elongata, cuneata.
Testæ lat., major, 0.93 ad 1.20; minor 0.76 ad 0.96; alt. 0.42 ad 0.54 poll. Angl.