308 The American Naturalist. [March, 
medullary grooves, and some other features of embryonic development 
in the Elasmobranchs. 
The following gentlemen were elected officers for the current year: 
President, Dr. C. O. Whitman, University of Chicago ; Vice-President, 
Dr. E. B. Wilson; Columbia College; Sec’y-Treas., Dr. J. Playfair 
McMurrich, University of Cincinnati. Members of the Executive 
Committee elected from the Society-at-large: Dr. T. H. Morgan, Bryn 
Mawr College; Dr. C. B. Davenport, Harvard College. 
Association of American Anatomists.—Fifth annual session, 
Tuesday to Thursday, December 27 to 29, 1892, at Princeton, N. J. 
The officers for the year 1891-1892 were—President, Harrison Allen, 
M. D., Philadelphia; First Vice-President, Charles Heitzman, M. D., 
New York City; Second Vice-President, Theodore N. Gill, M. D., 
Washington, D. C.; Secretary and Treasurer, D. S. Lamb, M. D., 
Washington, D. C. Executive Committee: Thomas Dwight, M. D., 
Harvard University ; E. C. Spitzka, M. D., New York City; Dr. F. H. 
Gerrish, Portland, Me., the President and Secretary, ex-officio. Com- 
mittee on Anatomical Nomenclature: Harrison Allen, M. D., Phila- 
delphia; Frank Baker, M..D., Washington ; Thomas Dwight, M. D.. 
Harvard University; Thomas B. Stowell, Ph. D., Potsdam, N. Y.; 
Burt G. Wilder, M. D., Cornell University, Secretary. Delegate to 
American Congress of Physicians and Surgeons, F. J. Shepherd, M. D., 
Montreal, Canada. Alternate, R. W.Shufeldt, M. D., Washington, D. C. 
Tuesday, December 27, the following business was transacted: 1, 
Opening of the session by the President; 2, Report of the Executive 
Committee ; 3, Report of the Secretary and Treasurer ; 4, Election of new 
members ; 5, Report of the Committee on Anatomical Nomenclature; 
6, amendment to Constitution, abolishing dues and substituting assess- 
ments; 7, Miscellaneous business. 
Then followed the address of the President, Dr. Harrison Allen. 
The following papers were read: 1. History of the development of 
bone tissue. Illustrated by microscopic slides. Dr. Carl Heitzmann, 
New York City; discussed by Professors Macloskie and Libbey. 2. 
Crania of the Cetacea (15 minutes), with specimens, Dr. Harrison 
Allen, University of Pennsylvania. 3, The human lower jaw (10 
minutes), with specimens, Dr. Allen, The second and third discussed 
by Dr. Herrick and Professor Macloskie. 4, An anomalous human 
sternum, Dr.C. S. Lamb, Washington, D. ©. Discussed by Dr. 
Dwight. 5. Observations on the psoas parvus and pyramidalis. A 
study on variation, Dr. Thomas Dwight, Harvard University. 6. 
