1881.] 



403 



specialization of that order. The posterior feet were more truly planti- 

 grade, for the extremity of the calcaneum reached the ground, while the 

 instep was elevated above it, being supported, no doubt, by a more or less 

 elastic pad. This arched" or angulate plantigrade type of foot, has a remote 

 parallel in that of man. It is quite unique among ungulate Mammalia. 



What difficulties the other parts of the skeleton may present, I do not yet 

 know, but I perceive nothing in the dentition which forbids the reference 

 of Toxodon to the Prohoscidia. The dentition is scarcely more ditferent 

 from that of Mastodon or Dinotherium, than that of Bos is from Bicotyles 

 or Hippopotamus. The former genera may be the extremities of a series 

 whose intermediate members are as yet undiscovered. In the latter case, 

 the intermediate forms are mostly known. 



Stated Meeting, May 6, 1881. 



Present, 22 members. 



President, Mr. Fraley, in the Chair. 



Capt. McCauley and Mr. Ellis Yarnall, two newly-elected 

 members were introduced to the presiding officer and took 

 their seats. 



Visitor, Lieut.-Commander Gorringe, U. S. N. 



Letters acknowledging receipt of diplomas were received 

 from Messrs. W. B. Taylor, C. P. Patterson, Asaph Hall, J. 

 J. Stevenson, C. F. Adams, J. F. Mansfield, A. S. McCreath, 

 J. Douglas, Jr., L. M. Haupt, R. H. Alison, 0. W. Holmes, 

 Alvan Clark and J. J. Sylvester. 



Letters accepting membership were received from Mr. 

 Alvan Clark, dated Cambridgeport, Mass., April 25th ; Prof. 

 J. J. Sylvester, dated Baltimore, April 25th ; Judge Wm. 

 Butler, dated Philadelphia, May 6th ; Prof. E. A. Barber, 

 4101 Walnut street, Philadelphia, April 25th, and Mr. W. 

 W. Griscom, 2009 Pine street, Philadelphia, April 18, 1881. 



Letters of acknowledgment for publication, and letters of 

 envoy were read from the Musee Guiniet, Herr Sommerbrodt, 

 of Breslau, April 11th, 1881 ; the Physico-Central Observa- 

 tory, St. Petersburg, the Smithsonian Institution, April 



PROC. AMER, PHILOS SOC. XIX. 108. 2y. PRINTED JUNE 1, 1881. 



