50 [April, 



ELECTION. 



Amory Eclwanis, Esq., of New York, and Charles IT. Budd, M. D., 

 of Peniberton, N. J., were elected 3fembei'!i, and Henry A. Ford, 

 M. D., of Liberia, Western Africa, was elected a Correspondent of the 

 Academy. 



April QfJi. 

 Vice-President Bridges in the Chair. 



L-'tters were read 



From the Royal Academy of Sciences at Vienna, dated October 26, 

 and December 12, 1851, transmitting the " Benksehriften, Mathe- 

 matische-Naturwissen. Classe,'^ rol. 3, part I, and '-Sitzungsbericht, 

 Mathemat. Naturwissen. Classe/' vol. 6 and vol. 7, parts 1 and 2. 



From Dr. F. H. Troschel, dated Bonn, Jan. 16, 1852, acknowledsinor 

 receipt of Proceedings of the Academy, vol. 5, Nos. 3, 4, 6, 7 and 8, 

 and requesting other numbers deficient in his series; also transmitting 

 " Archiv fur Naturgeschichte/' No. 6, 1849, No;?. 2, 3, 4 and 5,1850, 

 and Nos. 1, 2, 3, 1851. 



From the Hoyal Academy of Sciences of Naples, dated Jan. 24, 1852, 

 acknowledging the receipt of late Nos. of the Proceedings. 



A paper was presented by Col. George A. McCall, intended for publi- 

 cation in the Proceedings, describing a new species of Carpodacus. Ee- 

 ferred to Mr. Cassin, Dr. AYoodhouse and Dr. LeConte. 



Dr. Woodhouse read a paper, intended for publication in the Pro- 

 ceedings, entitled, "Description of new species of Birds of the genera 

 Vireo, Vieill. and Zonotrichia, Sicain.," collected by the author in Texas, 

 while attached to the late U. S. Expedition under Captain L. Sitgreaves, 

 for exploring the Zuni and Colorado Rivers of the West. Referred to 

 Col. McCall, Mr. Cassin and Dr. Wilson. 



Dr. LeConte offered the following additional remarks on some 

 fovssil Pachyderms, from Illinois, referred to on page 3 of the present, 

 volume : 



Having recently had an opportunity of inspecting an entire skull in the pos- 

 session of Dr. Leidy, closely allied to, if not identical with the craniuna described 

 by me as Hyops, and afterwards as Dicotyles depressifrons, I have the satisfac- 

 tion of being able to arrange this confusing nnixture of bones in a natural man- 

 ner. I have seen distinctly that the parts described as belonging to the upper 

 jawof Platygonus compressus, in reality belong to Hyops, but that the singularly 

 dilated lower jaw associated with them, is part of another animal for which the 

 name Platygonus must be retained. The large inferior canine referred to Dico- 

 tyles depressifrons is perhaps the canine of the genus with dilated jaw ; at any 

 rate, it cannot belong to Hyops, and until the canine of Platygonus is found in 

 situ, it would be more natural to consider it as not indicating a third animal, of 

 which no other trace remains. 



The inferior molars and canine from another locality, on which the genus 

 Protochcerus was founded, also belong to Hyops. In palliation of this blunder, I 

 may say, that the cranium end superior canines and molars of Hyops were asso- 

 ciated with no lower teeth except those in the fragment of dilated jaw, which 



