REPORT OF NATIONAL MUSEUM, 1910. 47 



The principal accessions in the division of invertebrate paleontology 

 consisted of collections made by or under the direction ot Or. Charles D. 

 Walcott, Secretary of the Smithsonian Institution, and by members 

 of the staff of the division. Of Cambrian fossils, extensive collections 

 were obtained by Dr. Walcott at various localities in Alberta, Canada, 

 during the summer of 1909, and later in Lawrence County, Pennsyl- 

 vania; in northeastern Utah by Mr. J. M. Jessup, in the same general 

 region by Mr. Eliot Blackwelder, and in Manchuria, China, by Dr. 

 J. P. Iddings, who secured over 6,000 specimens. All of this field 

 work, except that by Mr. Blackwelder, was conducted under the 

 auspices of the Institution, in the interest of the important investiga- 

 tions of this early geologic fauna, which has occupied the attention of 

 Dr. Walcott for many years. Of Ordovician and Silurian fossils about 

 3,000 specimens were collected in the Ohio Valley by the curator. 

 Dr. R. S. Bassler, and an important series in northeastern Utah, by 

 Mr. J. M. Jessup. Eocene fossils from Wilmington, North Carolina, 

 to the number of over 2,000, were received as a gift from Prof. B. L. 

 Miller, of Lehigh University. Other donations of which mention 

 should be made comprised Tertiary fossils from the Olympic penin- 

 sula of Washington, from Mr. Albert B. Reagan, of La Push, Wash- 

 ington; and Ordovician and Silurian fossils from the island of Anti- 

 costi, Canada, from the Yale University Museum. 



Among the additions in the division of vertebrate paleontology were 

 a skull and lower jaw associated with other parts of the skeleton of a 

 Cretaceous crocodile, Leidyosuclius, from Kansas; a complete skull 

 and neck of Clidastes velox, from the same place; and a complete 

 skeleton of a small rhynchocephalian reptile, Homoeosaurus maximili, 

 from Germany. Mr. J. W. Gidley, of the division, under the auspices 

 of the United States Geological Survey, collected some important 

 mammalian remains in the Fort Union formation, near Fish Creek, 

 Sweet Grass County, Montana. These specimens are of rare scientific 

 value and, together with previous accessions from the same formation 

 and localitv, make the iluseum collection the best known of Fort 

 Union mammals in the world. A collection of turtle remains from the 

 Cretaceous of New Mexico, obtained by Mr. Gidley and Mr. J. H. 

 Gardner, also for the Geological Survey, comprise the type specimens 

 of eight new species. 



The division of paleobotany received from the Geological Survey 

 the types and figured specimens of fossil plants described by Mr. 

 Arthur Hollick in Monograph 50 of the Survey, entitled ''The Cre- 

 taceous Flora of Southern New York and New England." Mention 

 should also be made of a large number of undescribed fossil plants 

 from Spitzbergen, presented by Mr. John M. Longyear, of Brookline, 

 Massachusetts, and of about 350 fossil plants from the Laramie and 



