Vice President, Dr. Trask, in the Chair.
Present, seven members.
Philip Lutley Sclater, Esq., of London, England, was elected a Corresponding Member.
Donations to the Cabinet:
Three species of Reptiles from San Mateo, and one from Marin County, collected and presented by Mr. Bolander.
Dr. Cooper communicated the following description of a new Californian Mollusc, discovered by Rev. Joseph Rowell, at Marysville, in the waters of Feather River.
Gundlachia Pfeiffer.
G. Californica Rowell. [[Fig. 5.]]
Fig. 5.