46 Report of the President 



of giant Ground Sloth skeletons, the skeletons (casts) of 

 Toxodon and Macrauchenia, and the skeleton of a small primi- 

 tive Ground Sloth. Four skeletons completed last year have 

 been installed in the Dinosaur Hall, and the Fort Lee Reptile 

 has been prepared and placed on exhibition in the corridor 

 opposite the elevator, together with the skeleton of a smaller 

 relative from North Carolina. 



The greater part of the collections of Cretaceous Dinosaurs 

 and Eocene mammals secured by Messrs. Brown and Granger 

 in 1910 have been prepared, a few to be mounted for exhibi- 

 tion, the remainder reserved at present for study and descrip- 

 tion. This work has occupied the major part of the time of 

 the laboratory staff. 



The zoological catalogue of fossil mammals has been com- 

 pleted by Dr. Matthew and Mr. Granger, 



Professor Osborn has continued his researches upon the 

 Titanotheres with assistance of Dr. Gregory. Dr. Matthew 

 and Mr. Brown have published a number of short popular 

 articles and notices for the Museum Journal. A new edition, 

 revised and extended, of the leaflet guide to the Evolution of 

 the Horse, is nearly completed, and one on the Dinosaurs is 

 under way. 



EXISTING REPTILES, BATRACHIANS, RECENT AND 

 EXTINCT FISHES 



Bashford Dean, Curator 



Department of Ichthyology and Herpetology. — There 

 have been many changes in the exhibition halls of the depart- 

 ment during the past year. The cases showing the zoological 

 succession of fishes, amphibians and reptiles (synoptic series), 

 have been notably enriched, and many of the specimens have 

 been modeled and colored from living material. Of the models 

 introduced there were 30 of fishes, 30 of amphibians, and 20 

 of reptiles. These represent " types " which have long been 

 needed to fill gaps in the series, including, for example, lung- 

 fishes, chimseroids, primitive salamanders, hagfishes, some of 

 which, by the way, were found particularly difficult to model. 



