RECORDS OF MEETINGS 263 



SECTIOISr OF BIOLOGY 



13 January, 1913 



Section met at 8 :15 p. m., Vice-President W. D. Matthew presiding. 

 The minutes of the last meeting of the Section were read and approved. 

 Dr. W. K. Gregory was elected secretary of the Section for the ensuing 

 year. 



The following programme was then offered : 



W. D. Matthew, Notes on Cuban Fossil Mammals. 



Barnum Brown, Remarks on the Occurrence and Discovery of 



Cuban Fossil Mammals. 



Walter Granger, Lower Eocene Faun^ of Northwestern Wyo- 

 ming. 



W. D. Matthew, A Zalambdodont Insectivore from the Basal Eo- 

 cene OF New Mexico. 



Summary of Papers 



Dr. Matthew exhibited and described skulls and other skeletal ma- 

 terial of Megalocnus Leidy and allied genera, secured by Mr. Barnum 

 Brown with the cooperation of Professor de La Torre. He discussed the 

 problem relating to the time and manner in which the peculiar mam- 

 malian fauna of Cuba had been derived. The most probable hypothesis, 

 he thought, was that the remote ancestors of these mammals had come 

 from South America, possibly having been preserved alive on one of the 

 great natural rafts from the great rivers which sometimes drift from 

 Brazil and Guinea toward Cuba. 



Mr. Brown exhibited stereopticon views illustrating the mode of occur- 

 rence and discovery of the fossils. The best remains of Megalocnus and 

 allied types had been secured in a hot spring near Barros de Ciego, Mon- 

 tero, Cuba. 



Mr. Granger said in abstract : The extensive explorations by American 

 Museum expeditions in the Lower Eocene formations of Wyoming have 

 resulted in making known a nearly complete and uninterrupted series of 

 faunal horizons from the Fort Union to the Bridger. Four new horizons 

 have been made known : from the Wind River series, the Lost Cabin and 

 Lysite horizons and from below the Wasatch an intermediate, unnamed 

 horizon and the Ealston. The faunae of each of these were described. 



Dr. Matthew said in extract: This very precious fossil skull was dis- 

 covered last summer by Mr. Walter Granger. It was an undoubted 



