REGULAR MEETING, JANUARY 15TH, 1866. President in the chair. Eight members present. Mr. Bolander presented his report, as Curator of Botany, for the year 1865, as follows. During the past year the Herbarium of the Academy has been increased— 1st. By a set of Hall’s Rocky Mountain Plants. 2d. By a collection of plants from the Western States, made by Mr. Elihu Hall. 3d. By a large collection made by Mr. Canby at Wilmington, Del. 4th. By a small collection from M. S. Bebb, Esq., Washington, D. C. To the above-mentioned collections, I have added specimens of each plant collected by myself during the past year. Dr. Kellogg and myself have presented to the Academy quite a number of Australian plants, and both Dr. Kellogg and Mr. Bloomer have assisted me in arranging and classifying our collections. REGULAR MEETING, FEBRUARY 5TH, 1866. President in the chair. Five members present. Mr. Dall presented the following paper by Dr. Canfield. Notes on Antilocapra Americana, Ord. BY DR. C. A. CANFIELD, OF MONTEREY. The following notes were taken from 1855 to 1858, in Monterey County, California, and were communicated to Prof. Baird in 1859. About the first of January the old bucks all shed their horns. A few days after, one was shot, with two hairy stumps or horn-cores, several inches long, just tipped with growing horn. This was observed to spread upward and downward till the whole of the process of the frontal bone was covered with horn. The “prong” commenced the same process at its tip, and gradually coalesced with the main horn, leaving no suture. As the horn increases in length it curves forward and inward. It takes several months to perfect the new horn. The females possess small curved horns, one to three inches long, sometimes recurving to the skull, which were not _proved_ to be deciduous. The horn, when shed, leaves a process of the frontal bone, covered with hair, soon replaced as above by horn at the tip. These facts were more minutely observed in two young bucks, reared by hand to the age respectively of one and two years. These facts would tend to separate the genus _Antilocapra_ from the family _Cavicornia_, and it may possibly form a family by itself. Prof. W. P. Blake read a portion of a letter from Dr. C. T. Jackson of Boston, containing a notice of a remarkable spider brought from Georgia by Dr. Wilder, an account of which has been published in the Proceedings of the American Academy and of the Boston Natural History Society. REGULAR MEETING, FEBRUARY 19TH, 1866. President in the chair. Nine members present. Dr. Colbert A. Canfield, of Monterey, was chosen a Corresponding Member, and Dr. Henry Gibbons and Mr. Henry Janin, Resident Members.