12 PROCEEDINGS OF THE ACADEMY OF [1886. 



a half dozen distinct species have been characterized as pertaining 

 to North America. An unworn crown of a last inferior molar 

 tooth resembles most nearly that of the Mastodon angustidens of 

 Europe, but is much larger. It has the same number of crests, 

 but the fifth is proportionately much more developed, being 

 divided into two lobes, about two-thirds the size of those of the 

 fourth crest. It is also much larger than in M. andium, and has 

 its lobes proportionately more robust, and is provided with a 

 well-produced external basal ridge. 



The following are comparative measurements of what appear 

 the most closely allied forms : 



Fore and aft. Transverse. 



Florida mastodon, . . 9 inches. 3^ 



M. angustidens, . . ^^ inches. 3^ 



M. andium, ... 8 inches. 3 



Small fragments of tusks indicate the possession of a band of 

 enamel, as in the M. angustidens. For the species, the name of 

 Mastodon (Trilophodon) floridanus was proposed. 



Among the fossils are several isolated teeth, and bones appar- 

 ently indicating three species of Llama. Judging from the 

 asti-agali, one was about the size of the existing South American 

 species ; another, of which there are five astragali, as large or 

 larger than the camel, and a third of intermediate size. The 

 measurements of the astragali are as follows : 



Large species. Length, 100 mm. Breadth, 70 mm. 

 Medium do. " 65 " " 42 " 



Small do. " 50 " " 35 " 



The three species may be distinguished by the names of 

 Atjchenia major, minor and minimus. 



Among the fossils is an astragalus of Megatherium. 



January 26. 

 The President, Dr. Leidy, in the chair. 

 Twenty-four persons present. 



The following were presented for publication : 



" On a Giant Conorbis from the Oligocene Deposits of Florida," 

 by Angelo Heilprin. 



" Notes on the Tertiary Geology and Paleontology of the 

 Southern United States," by Angelo Heilprin. 



Roland D. Jones, M. D., was elected a member. 



Charles Wachsmuth, of Burlington, Iowa, and Alfred M. Mayer, 

 of Hoboken, N. J., were elected correspondents. 



The following were ordered to be printed : 



