1896.] NATURAL SCIENCES OF PHILADELPHIA. 291 



The Ulna of the Common. Broicn But. — Dr. Harrison Allen 

 called attention to the ulna in the common Brown Bat, Adelo)njc- 

 terisfusca. The ulna in the Vespertilionidae had been described by 

 some authors (e. g. de Blainville) as ending free in the muscles of 

 the forearm. Dr. Allen believed he had demonstrated this arrange- 

 ment in Adelonyderis and Vespertllio. Others assert that in all the 

 bats the ulna is anchylosed to the shaft of the radius. Dr. Allen 

 wished to revise his former statement* on this subject. In a fully 

 adult specimen of the bones of the forearm which he had subjected 

 to prolonged boiling, Dr. Allen found that the ulna by gentle trac- 

 tion could be separated from the radius and be traced as a slender 

 filament along the entire length of the forearm and to end at the 

 wrist joint. The arrangement in the adult, in this species at least, 

 is, therefore, not different from that found in the embryo. 



The following were ordered to be printed : — 

 iMon. N. A. Bats, 1894. 



