[6] Named in memory of the distinguished author of the Zoological portions of the “Natural History of New York,” Dr. James E. Dekay. [7] The name of Dr. W. O. Ayres, is well known in connection with Ichthyology, especially that of California. REGULAR MEETING, NOVEMBER 16TH, 1863. Dr. Kellogg in the Chair. Six members present. Dr. Cooper read a letter from Mr. A. S. Taylor, now of Santa Barbara, complaining that his name had been omitted from the list of corresponding members, though he was elected several years since. It was resolved that his name be restored, having been omitted on account of his new address being unknown to the Secretary. Mr. Bolander read the following article: Enumeration of Shrubs and Trees growing in the vicinity of the mouth of San Francisco Bay. BY HENRY N. BOLANDER. The territory in question is divided naturally into three parts: 1. The northern part of the peninsula of San Francisco, with an undulating and hilly surface, consists of drifting sand, with a small per centage of humus mingled with it. 2. The Oakland Hills, running N. 54° W. mag., from the Bay of San Pablo to San Leandro, a distance of twenty-three miles, with the adjacent slopes and valleys. Heavy clayey soil predominates; but where shrubs and trees grow it is mostly a loose, light, and slightly sandy soil. 3. That part of Marin County between San Rafael, the head of Tomales Bay and Bolinas Bay, forming a triangle, with a hilly surface, the ridges running N. 54° W. mag. Soil a heavy clay, in the valleys and on bare hills; or a light, slightly sandy loam among shrubs and trees. In all parts a metamorphic sand-stone underlies the soil. _Berberis (Mahonia) Aquifolium_ Pursh. A low evergreen shrub, three to four feet high, not gregarious; in clay soil on the hill sides; rare. _Dendromecon rigidum_ Benth. A shrub with slender upright branchlets, four to six feet high, rare; on white sand-stone, Oakland hills, third range eastward, not gregarious. _Rhus diversiloba_ Torr. and Gray. POISON OAK. Everywhere, deciduous, exceedingly variable, three to eight feet high. _Negundo Aceroides_ Mœnch. BOX-ELDER. A medium sized tree, twenty to thirty feet high; common among the Oakland hills, on banks of creeks. _Acer macrophyllum_ Pursh. LARGE-LEAVED MAPLE. Common on the banks of Walnut Creek, N.W. of Mount Diablo; fifty to seventy feet high, and two to five feet in diameter, in light sandy soil. _Æsculus Californica_ Nutt. HORSE-CHESTNUT. Mostly a shrub, seldom a medium sized tree, largest on the banks of creeks and moist hill sides; grows commonly in groups. Common. _Euonymus Occidentalis_ Nutt. SPINDLE-TREE. A shrub seven to fifteen feet high, with slender upright branches; in swampy places, near the head of Tomales Bay; rare.