196 Field Museum of Natural History — Reports, Vol. X 



and a half in Kentucky collecting cave material. Assistant Curator 

 Sharat K. Roy spent five weeks in the field at Peru, Nebraska, and 

 near Lancaster, Pennsylvania. He carefully avoided collecting 

 material which would duplicate any already in the Museum and 

 collected only specimens to fill gaps in the present collections. 

 Eighty-two specimens were gathered: twenty-one from the Penn- 

 sylvanian of Nebraska, and sixty-one trilobites from the Lower 

 Cambrian of Pennsylvania. Three of the specimens from Nebraska 

 represent a hitherto unknown crustacean. The Cambrian collection 

 from Pennsylvania has not yet been worked over but it is known 

 to include several perfectly preserved trilobites. 



Studies and descriptions of specimens collected by the Marshall 

 Field Paleontological Expeditions to South America were continued 

 through the year by Associate Curator Riggs and Assistant Bryan 

 Patterson. Some of the results were incorporated in a memoir on 

 a new marsupial sabertooth by Messrs. Riggs and Patterson, which 

 was published in the Transactions of the American Philosophical 

 Society. Other results appeared in four octavo papers written by 

 Mr. Patterson and published by the Museum. 



Assistant Curator Roy wrote a memorial of the late Dr. Oliver 

 Cummings Farrington, former Curator, with a complete bibliog- 

 raphy, which was published in the Proceedings of the Geological 

 Society of America. He also prepared or worked on the preparation 

 of five other papers during the year. Three of these. New Silurian 

 Phyllopodous Crustaceans, A Silurian Conularia with Internal Septa, 

 and The Grinnel Glacier, are to be published by the Museum early 

 in 1935. Mr. Roy has also continued work on his Geology and 

 Paleontology of Southeastern Bafinland. 



Research by Assistant Curator Roy intended to refute or confirm 

 the reported discovery of living bacteria in stony meteorites by Dr. 

 Charles B. Lipman of the University of Southern California, was 

 continued through the year and is now nearly finished. Unforeseen 

 delay in completing this work was caused by difficulty in verifying 

 the sterilization of the external surface of the meteorites. A peculiar 

 precipitate which simulated bacterial growth appeared on the 

 surfaces. This growth is now known to be a chemical precipitate 

 derived from a mineral peculiar to meteorites, so that the work is 

 now nearing completion. As usual, thin and polished sections of 

 fossils for identification and research were made in the laboratory. 



Miss Elizabeth Oliver, volunteer assistant in paleobotany, began 

 the identification and classification of the collection of fossil leaves 



