There is a form referred to _H. fidelis_, from Humboldt Bay, which may also prove a new species. It is entirely purplish black, _without bands_, the lips white inside, and differs from _infumata_ chiefly in great elevation and thicker lips, having even the subcarinate body whorl of the latter, and the same number of whorls (6½). There is, however, no trace of bristle marks, and some specimens appear to connect it with _fidelis_, suggesting a possibility of its being a hybrid. The State Collection contains one specimen, obtained from the late Dr. Frick. Diam. maj. 1.24; min. 1.09; alt. 0.70 inch. [24] In this the band seems obscured in the general blackness of the shell; occasional varieties of several others are found without the band, as if from disease, as in _H. anachoreta_. [25] These species have parallel spiral grooves, not _rugæ_. REGULAR MEETING, APRIL 16TH, 1866. President in the chair. Five members present. Mr. Horace F. Cutter was elected a Resident Member. The Committee on rooms reported that two rooms had been hired for the Academy on the southeast corner of Montgomery and Sacramento streets. REGULAR MEETING, MAY 7TH, 1866. President in the chair. Eight members present. Mr. Harford presented some ivory nuts from Panama. Dr. Gibbons made some remarks explanatory of a series of tables which he exhibited, showing the variations of rain fall at San Francisco, and their relation to the phases of the moon. He showed that the greatest amount of rain fell immediately before the time of full moon, and that, following the day of the full, the diminution in quantity was very rapid. The series of observations from which the tables were prepared extended over a period of fifteen years. Dr. Gibbons remarked that he proposed continuing the investigation of the subject of the connection of the moon’s phases with the fall of rain, and that he would prepare a paper on the subject. Considerable discussion followed on the subject of the weather of this coast, in which nearly all the members present took part. REGULAR MEETING, MAY 21ST, 1866. Mr. Stearns in the chair. The Academy met for the first time in its new rooms on the corner of Montgomery and Sacramento streets; twelve members were present. Donations to the cabinet: Two boxes of shells, from the Smithsonian Institution.