26 ANNUAL REPORT SMITHSONIAN INSTITUTION, 195 7 



for the display series. Arrangements were made with Dr. B. Hauff 

 of Holzmaden for a series of lower Jurassic fishes. At the Museum 

 National d'Histoire Naturelle, Paris, desirable exchanges were dis- 

 cussed with the staff. Dr. Dunkle returned to Washington on Novem- 

 ber 9, 1956. 



Dr. Dunkle accompanied Dr. G. E. Lewis, U. S. Geological Survey, 

 May 6-20, 1957, on a reconnaissance of the occurrence of fossil 

 mammal-like reptiles (ictidosaurs) in the Kayenta formation on the 

 western Navaho Indian Reservation, Ariz., with the objective of 

 locating skeletons for exhibition. 



Following approval of an exchange arrangement, Franklin L. 

 Pearce and John E. Ott were sent on November 23, 1956, to the Museum 

 of the University of Texas at Austin to assemble and pack for shipment 

 a Triassic phytosaur skull and the field blocks enclosing the giant 

 Cretaceous fish Xiphactinus. When preparation is completed these 

 specimens will be incorporated in the display series. 



Dr. G. A. Cooper, curator of invertebrate paleontology, was invited 

 by the organizers of the Twenty-second International Geological 

 Congress, Mexico City, to lead a field excursion late in August 1956 

 to Sonora, where the party studied the Cambrian sequence near 

 Caborca and the Permian, Mississippian, and Devonian near Antimo- 

 nio. The Walcott bequest financed the fieldwork by Dr. Cooper in the 

 Glass Mountains of Texas and in south-central New Mexico. On 

 August 13, 1956, while accompanied by Dr. C. O. Dunbar of Yale 

 University, L. G. Henbest of the U. S. Geological Survey, and Dr. 

 John Skinner of the Humble Oil Co., Dr. Cooper reviewed the Per- 

 mian stratigraphy in the vicinity of Marathon, Tex., and subsequently 

 collected additional blocks of invertebrate materials. The field truck 

 was driven to Nogales, N. Mex., prior to the Mexican excursion. 

 When the Geological Congress terminated, Dr. Cooper returned to 

 Nogales where A. L. Bowsher and J. T. Dutro of the U. S. Geological 

 Survey joined the party for the Devonian stratigraphic fieldwork in 

 the vicinity of Silver City and Hillsboro, N. Mex. At Hillsboro, 

 Mississippian fossils also were collected. During the last week of 

 September and the first half of October, Alamogordo served as head- 

 quarters for the fieldwork in the San Andreas Mountains located in 

 the White Sands Proving Ground area. Field studies in New Mexico 

 were concluded at several localities in the Sacramento Mountains east 

 of Alamogordo. 



The income from the Walcott bequest and assistance from the Na- 

 tional Science Foundation enabled Dr. David Nicol, associate curator 

 of invertebrate paleontology, to conduct marine fieldwork at the 

 Bermuda Biological Station during July 1956. He collected recent 

 and fossil mollusks, gorgonians, Foraminifera, and fishes. Dr. Nicol 



