r 



EEPORT OF NATIONAL MUSEUM, U»10. 



employment on the Geological Survey. Dr. J. E. Pogue, assistant 

 curator of mineralogy, completed four studies on Museum material, 

 and devoted some time to the examination of calamine crystals from 

 Mexico, phlogopite-biotite intergrowths from Ottawa, Canada, and 

 certain unusual pseudomorphs of marcasite after pyrrhotite from 

 Osnabruck, Prussia. An account of the turquoise was also begun, 

 and some work was done on the optical and crystallographic charac- 

 ters of carnotite and certain vanadium minerals from Peru. 



Dr. Ray S. Bassler, curator of invertebrate paleontology, finished 

 a work which had extended over a period of four or five years on the 

 stratigraphy of the Ordovician rocks of Russia, with a description of 

 their bryozoan fauna. He spent two weeks in the Ohio Valley in 

 examining the Ordovician and Silurian rocks ; and the month of June, 

 1910, in a survey of the Silurian and Mississippian rocks in Kentucky 

 and Tennessee for the purpose of securing certain geologic data 

 needed by the Hon. Frank Springer for the completion of his work 

 on the Crinoidea Flexibilia. Reference has already been made to 

 the collections obtained from these expeditions. The assistant cura- 

 tor, Mr. L. D. Burling, began the stud}^ of some Ordovician brachio- 

 pods in the collection of the Museum of Comparative Zoology at 

 Cambridge; completed his work in connection with the Secretary's 

 monograph of Cambrian brachiopoda, and continued that on the 

 Ordovician fauna of Colorado and Wyoming. He has also prepared 

 a catalogue of all the Cambrian brachiopoda in the Museum, giving 

 complete data for each figured specimen. Dr. William H. Dall, asso- 

 ciate curator, has been engaged in research work on the fossils of the 

 Oligocene silex beds of Tampa, Florida, and has nearly completed a 

 study of the fossils of the Lake beds of Meteor Crater, Arizona. 



In the division of vertebrate paleontology, IMr. J. W. Gidley, cus- 

 todian of mammalian remains, continued his studies of the Fort Union 

 fossil mammals, of the skeleton of Basilosaurus (Zeuglodon) now in 

 process of mounting, and of Oligocene and Miocene rodents. Mr. 

 C. W. Gilmore, custodian of reptilian remains, completed papers on a 

 new rhynchocephaiian reptile from the Jurassic of Wyoming and a 

 new crocodile fi'om the Cretaceous of Kansas. He also devoted con- 

 siderable tune to a study of the fossil reptiles of the southern coastal 

 plain. 



DISTRIBUTION AND EXCHANGE OF SPECIMENS. 



The distribution of regular sets of duplicate specimens during the 

 past year was confined almost entirely to invertebrate fossils, of which 

 61 sets, containing 3,214 specimens, were sent out. In addition, 

 2,732 specimens, of which 1,-962 were biological, 752 geological, and 

 18 anthropological, were selected from the duplicates to meet special 

 applications. To specialists not oiJicially connected witli the Museum 



