I found but one specimen of this fish at San Diego, where it was caught in a seine. I have also seen one, when the steamer was lying at anchor, at San Pedro, swimming near the surface of the water, apparently supporting itself by flapping its wing-like expansions, while it progressed slowly by lateral motions of its tail. NOTE.—By an oversight of the printer, the proper references to the figures on page 110 were left out. The reader will however understand from the descriptions that the right hand figure is the _Myxodes_ (Fig. 23), and the others the _Gillichthys_ (Fig. 24). TRANSCRIBER’S NOTE.—This oversight has been addressed! Illustrations were relabelled correctly and placed next to the text describing them. [8] Named in honor of Mr. THEODORE GILL, of the Smithsonian Institution, Washington D. C., the author of various learned treatises on fishes; ICHTHYS, from the Greek for fish. REGULAR MEETING, JANUARY 18TH, 1864. President in the Chair. Present twelve members, four visitors. Donations to the Cabinet: Cone of _Pinus pinea_ from the south of Europe, by Mr. Grosseillier. Bottle of Scorpions and other insects, by Mr. Dawson. Jar of fruits, and cloth made by the natives of Hilukukaki Island, by Capt. J. B. Edwards: A jar of alcoholic specimens from Rio Janeiro, one from Panama, and one from Acapulco, by S. Hubbard. A specimen of _Phasma_ from Manzanillo, Mex., by Col. Heintzelman. A specimen of _Gordius_ from this vicinity, by Mr. Keith. A box of cretaceous and tertiary fossils from the Atlantic States, by the Smithsonian Institution. Donations to the Library: