64 PROCEEDINGS OF THE ACADEMY OF [1890. 



species B. Schiedeamis and B. dealbatus. He stated that the new 

 form while belonging to the same group, is slenderer than B. Schie- 

 deanvs, and is stronghj longitudbially striate, differing in this char- 

 acter from all other known United States ^((7u/u(7/. This character 

 will also separate it from Mexican forms of the genus. The speaker 

 proposed to call it Bidlmxdas Ragsdalei. 



March 18. 

 Mr. Harold Wingate in the chair. 



Fifteen persons present. 



A paper entitled " Contributions to a further knowledge of the 

 North American Hesperidce." By Eugene ]M. Aaron, was presented 

 for publication. 



March 25. 



The President, Dr. Joseph Leidy, in the chair. 



Sixteen persons present. 



A paper entitled " Synopsis of the American Carbonic Calyptrte- 

 id?e." By Charles R. Keyes, was presented for publication. 



Fossil Vertebrates from Florida. — Prof. Leidy stated that he had 

 recently i-eceived from Archer, Florida, seven boxes of fossil bones 

 and teeth, collected by Mr. J. B. Hatcher, under the direction 

 of Prof Marsh, by whom they Imd been submitted to him for 

 examination on account of the United States Geological Sur- 

 vey. The collection was from the same locality from which 

 others had been formerly sent to him through the Survey. It 

 contains many specimens of interest but none adding to the species 

 already announced. For the most part they consist of remains of 

 Mastodon fioridanus, Rhinoceros proterus and Auclienia major. 

 Of the first there are a number of well preserved molar teeth and 

 among them specimens confirming the observation of H. von Meyer, 

 that in this genus two premolars succeeded the series of deciduous 

 molars. 



According to Mr. Wm. H. Dall, who visited the bone beds, the 

 fossils are found in a tenacious clay, without pebbles, occupying de- 

 pressions of the oligocene limestone of the country. 



The fossils consist of isolated bones, fragments of others, and teeth, 

 mostly of the larger and firmer kind, well jireserved and neither 

 water-rolled nor weather-worn. Portions of skulls and the hollows 

 of Mastodon molars are usually filled with comminuted bones min- 



