88 REPORT OF NATIONAL. MUSEUM, 1925 



region, in collections from the Idaho formation of Snake River 

 Valley. 



Dr. F. H. Knowlton has continued his paleobotanical researches, 

 having now in preparation a description of the flora of the Puget 

 group of Washington. 



Such time as could be allotted to research by Mr. Gilmore during 

 the first half of the year was devoted to completing his monographic 

 study on the North American fossil lizards. This work, undertaken 

 under a grant from the Marsh fund of the National Academy of 

 Sciences, was completed and transmitted for publication by the 

 Academy. 



Studies of the fossil footprints from the Grand Canyon are near- 

 ing completion and the results will shortly be submitted to the 

 Museum for publication. A third manuscript dealing with the 

 osteology of an unusually perfect skeleton of a new aetosaurian 

 reptile from the Morrison formation of Utah has been prepared for 

 publication by the Carnegie Museum of Pittsburgh, and a short 

 paper descriptive of a beautifully preserved skull of an extinct 

 anguid lizard was prepared and submitted to Kansas University for 

 publication. 



Dr. J. W. Gidley reports progress in his technical study of the 

 mammals collected in the San Pedro Valley. He has completed 

 studies of the Pleistocene material collected in 1921 at Willcox, in 

 the Sulphur Springs Valley, Ariz., its geological occurrence and 

 age of the deposits. The work is being carried on jointly with Dr. 

 Kirk Bryan of the Geological Survey, who has worked up the 

 geologic structure of the entire valley. A study of a new species of 

 ruminant from a Pleistocene cave deposit of Chihuahua, Mexico, is 

 under way. 



Visiting scientists and others not directly connected with the 

 Museum have had, as heretofore, free access to the collections for 

 study and reference, the advantage in many cases being mutual. 

 The mineral and economic collections have been utilized by members 

 of practically all scientific institutions in the city; Dr. A. F. Foerste 

 continued his monographic study of the Paleozoic cephalopods and 

 cystids ; Dr. L. W. Stephenson, Dr. J. B. Reeside, Dr. Julia Gardner, 

 Dr. C. W. Cooke, Dr. W. P. Woodring, and W. C. Mansfield, all of 

 the Geological Survey, have been actively engaged on the Mesozoic 

 and Cenozoic collections of invertebrates; Dr. Arthur HoUick con- 

 tinued his study of the Tertiary flora of Alaska ; Remington Kellogg, 

 of the Biological Survey, his work on fossil cetaceans and other 

 pelagic mammals; and Dr. O. P. Hay his researches on the Pleisto- 

 cene vertebrates. 



