over Lophogaster typicus, von Dr. M. Sars, Christiana, 1862; Geologiske undersögelser af Dr. Theodor Kierulf, Christiana, 1862; Zwei Karten zur geognostischen Beschreibung der preuss. Oberlausitz, von E. P. Glocker; Mittheilungen der Naturf. Gesellschaft in Bern, 1858, Nos. 408-423, 1859, 424-439, 1860, 440-468; Verhandlungen der Schweizerischen Naturf. Gesellschaft, 43te Versammlung, Bern, 1859; Correspondenzblatt des Naturf. Vereins zu Riga, 12ter Iahrgang, 1862; Bericht über die Thätigkeit der St. Gallischen Naturwissens. Gesellschaft, 1858-1860; Atti della Società elvetica delle Scienze Naturali riunita in Lugano, 1860, 44th Session; Verhandelingen van het Bataviaasch Genootschap, Part xxvii, 1860, xxviii, 1860; Tijdschrift voor indische Taal-Land-en Volkenkunde, Deel vi, 2-7, vii, 1-6, viii, 1-6, ix, 1-6, x, 1-6 (1860); Studien aux der Natur, von Dr. Ad. Weiss und J. G. Weiss; Fluorescenz der Farbenstoffe, von Dr. Ad. Weiss. Mr. Gabb presented the following paper by Mr. Rémond: Description of Four New Species of Echinodermata, from the Tertiaries of Contra Costa County. BY AUGUSTE RÉMOND. ASTRODAPSIS Conrad. _A. Whitneyi_ Rémond. Disk circular, or sub-pentagonal, slightly notched at the extremity of the ambulacra. Apex central and elevated; edge depressed. Ambulacral star symmetrical, prominent near the apex; petals equal, reaching to the margin of the disk. Interambulacral spaces much depressed near the edge. Lower surface slightly and gradually concave; furrows well marked and straight. Mouth central, circular; anal aperture small, sub-marginal. Papillary tubercles somewhat remote, smaller above than beneath, situated in wide and shallow cells; miliary tubercles very numerous and crowded, both on the superior and inferior surfaces. Greatest diameter 1.8 inches Smallest diameter 1.65 ” Height 0.3 ” Locality: Kirker’s Pass formations. Found in lower pliocene beds. The genus astrodapsis, to which I have referred the above species, was indicated by Mr. Conrad, in the Pacific Railroad Reports, Vol. VII, Palæontological Report, page 196, without any generic description. The genus is closely allied to clypeaster, but differs from it in having the petals of the ambulacral star extending to the edge of the disk, opened at the extremity, and in the margin of the disk being slightly notched at the extremity of each petal. The inter-ambulacral spaces are depressed. On the under surface there is a deep groove corresponding to each petal. My collection, and that of the State Geological Survey. _A. tumidus_ Rémond. Disk rounded sub-pentagonal, thick, rounded on the edge, very slightly notched at the end of the ambulacral areas. Apex small, central, depressed.