ABSTRACTS OF PAPERS 147 



DISEASES OF THE MOSASAURS 

 BY ROY L. MOODIE 



(Ahs'fract) 



During the Cretaceous, diseases of animals reached a maximum of develop- 

 ment in the mosasaurs, dinosaurs, plesiosaurs, and their associates. The num- 

 ber of diseases known to have aflflicted these animals are numerous and varied. 

 Some of them are apparently identical with the diseases of animals and man 

 today. Others have probably become extinct with the race of animals which 

 they afflicted. The diseases of the mosasaurs may be taken as an example of 

 the diseases of the Cretaceous. Their importance may be seen from the graph 

 showing the general geological development of disease. The diseases which 

 afflicted the mosasaurs, such as caries and pyorrhea, were common in geolog- 

 ical time. Others, such as periostitis and necroses, are not so common, but are 

 evident in the group. The paper will be illustrated by lantern slides showing 

 examples of diseases of the mosasaurs. 



(This paper is not to be published separately, but is a part of a monograph, 

 under preparation, on "Paleopathology, a study of the antiquity of disease,") 



A paper dealing with the jDaleobotanic side of paleontology was next 

 presented by the author, who illustrated his remarks with a number of 

 especially well preserved specimens. 



REPORT ON A COLLECTION OF OLIGOCENE PLANT FOSSILS FROM MONTANA 



BY O. E. JENNINGS 



(Ahs'fract) 



A report on a collection of about two hundred leaf-impressions collected a 

 few years ago by Mr. Earl Douglass, mostly from the White River beds near 

 Missoula, Montana, and now in the Carnegie Museum. 



The specimens are in a fine volcanic ash and are excellently preserved. 

 There are fourteen species represented, five of these being conifers, the re- 

 mainder being broad-leaved trees, with the exception of a fragment of a leaf 

 of a sedge. The most abundant species is Garpinus grandis Unger, other com- 

 mon species being Taxodiurti duMum (Sternberg) Heer and a Sequoia closely 

 related to 8. coiittsiw Heer. Among notable species for North America are 

 Cliamcecyparis ehrenstoardi Heer and Thuyopsis gracilis Heer. 



There was then presented by the author and discussed by Doctor 

 Matthew the following paper, illustrated by lantern slides: 



NEW TILLODONT SKULL FROM THE HUERFANO BASIN, COLORADO 

 BY WALTER GRANGER 



(Ahs'fract) 



Our knowledge of the skull and dentition of the large Middle Eocene Tillo- 

 donts has previously been derived almost wholly from a single specimen from 



