1887.] PEOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 21 LIST OF RECENTLY IDENTIFIED FOSSIL PLANTS BELONGING TO THE UNITED STATES NATIONAL MUSEUM, WITH DESCRIPTIONS OF SEVERAL NEW SPECIES. BV £iEO liESQUKKGUX, Columbus, Ohio. [Compiled and prepared for publication by F. II. Kuowlton.] (With four plates.) NOTE OF EXPLANATION. The followiug list comprises the identification of a large amount of material that has been accumulating in the Department of Fossil Phiuts since the founding of the Smithsonian Institution. This material, filling some fourteen boxes, was sent to Professor Lesquereux in September, 1885, and returned by him, named and labeled, in July, 1886. Much of the material was in a fragmentary condition, and was found to be in-capable of satisfactory specific or even generic determination, and such has been discarded. As many of the specimens were without labels or other data by which they could be located, this will account for the frequently recurring statement that the locality and collector are un-known. Several new species, of which descriptions and figures will be found in the text and plates, have been detected by Professor Lesquereux. These have generally been named for the discoverers. The first number given the specimen is the regular catalogue number of the Museum collection of fossil plants. The lot number refers to the number given each lot of specimens before they were sent to Columbus. This was done to prevent confusion when there were numerous speci-mens representing different species from the same locality. ALGiE. FUCACE^. 1. Palaeophycus irregularis Hall. Head of Eed Water Valley, Black Hills, Dakota ; H. Newton, col-lector, 1875 ; nineteen specimens ; Museum number 2145 ; 9 specimens collector's number, 8684. Museum number, 2146 (1 specimen) ; collect-tor's number, 8685. Museum number, 2147 (7 specimens) ; collector's number, 8685. Museum number 2148 (2 specimens) ; collector's num-ber, 8689. 2. Palaeophycus tubularis Hall. Head of Ked Water Valley, Black Hills, Dakota; H. :N"ewtou, col-lector, 1875; seven specimens; Museum number, 2149; collector's num-ber, 8684.