Authorities are not at hand for comparing the chemical composition of all the masses belonging to this series, or belt, which have been analyzed; but it is my impression that those meteoric irons which have been examined do resemble each other sufficiently, in the nature and proportion of the ingredients they contain, to add to the probability of their having had a common origin. The specimens thus far analyzed do not represent more than half the localities known to exist. A farther and more complete investigation of the physical and chemical character of all the meteoric masses of Arizona and Mexico, with reference to the possibility of their being originally parts of one body, is suggested as an interesting subject for those specially devoted to this class of researches. The following resolution, introduced by Professor Whitney, at a previous meeting, in accordance with the Constitution, was adopted. _Resolved_, That any Corresponding Member who may take up his residence in this city, may become a Resident Member, on notifying the Recording Secretary that such is his wish. Mr. W. H. Dall was elected a Resident Member, December 4th, 1865. REGULAR MEETING, MARCH 5TH, 1866. President in the chair. Eleven members present. Donations to the Library: Société de Géographie de Genève; Mémoires et Bulletin, Tomes I-III; From F. Berton. The following papers were presented. Note on Octopus punctatus, Gabb. BY W. H. DALL, ACTING DIRECTOR SCI. CORPS W. U. T. EX. A half-decayed specimen of this species, (described by Mr. Gabb, in Proc. Cal. Acad., Ap. 7th, 1862) discovered in some alcoholic miscellanea, recently, afforded the following observations. The buccal plates or mandibles, resemble those of _O. tuberculatus_, Blainv. [Woodw. Man. Pl. I. _Fig. 2_] but are more produced longitudinally. They are black and very brittle. [Illustration: (_Fig. 27._)] Dental formula, 3·3·3 (_Fig. 27_, A), or 1/(1×1)·2·1· _Rhachis_ armed with one central quinquedentate tooth, and two lateral, simple, denticles; the insertion of all is broadly arcuate. The _pleuræ_ are provided each with two simple recurved uncini and one rhomboidal plate with a small recurved hook. The central rhachidian tooth is occasionally irregular. (_Fig. 27_, L, X). When immature, the dental laminæ are without color, more slender, compressed, and the dentations are less distinct. (_Fig. 27_, ‛L.) Immature rows, about 15, perfect 60, worn and broken 25, total 100. Mag. 100 diameters. Length of specimen 3 feet. Locality, near San Francisco. From the market.