372 



PROCEEDINGS OF THE ACADEMY OP 



November 25. 



The President, Dr. Ruschenberger, in the chair. 



Twenty-nine members present. 



The following paper was presented for publication : 

 " Description of seven new species of Unionidffi of the United 

 States." B}^ Isaac Lea. 



The Committees to which were referred the following papers : 

 " On the Homologies and Origin of the types of Molar Teeth in 

 Mammalia Educabilia," b}'^ Edward D. Cope, and " Contributions 

 to the Ichthyology of Alaska," by Edward D. Cope, reported in 

 favor of their publication in the Journal. 



The death of Frank Guckert, Correspondent of the Academy, 

 was announced. 



Disposition of the Flexor perforans^ Flexor longus hallucis^ and 

 Flexor accessorius in Paradoxurus miisanga Gra3\ Dr. H. C. 

 Chapman made the following remarks : 



I have pleasure in calling the attention of the members of the 

 Academy to the arrangement of the Flexor 

 longus hallucis and Flexor accessorius in the 

 Musanga. For the opportunity of dissecting 

 the animal I am indebted to the Directors of 

 the Zoological Garden. Usually in pentadac- 

 tyle animals there is found a muscle, the Flexor 

 longus hallucis, which, rising from the fibula, 

 passes down to the sole of the foot, and after 

 giving a slip to the Flexor perforans is inserted 

 into the hallux. In man and some other ani- 

 mals, there also exists a muscle, the Flexor 

 accessorius, which, rising from the calcanouni, 

 is inserted into the conjoined tendon of the 

 Flexor perforans and Flexor longus hallucis. 

 The names of tliese muscles indicate their func- 

 tion. In the Musanga, however, the muscle /^, 

 which is homologous with the Flexor longus 

 hallucis of man, etc., simply fuses witli tiie ton- 

 don of the Flexor perforans. A., wiiile the Flexor 

 accessorius, C, after giving off muscular slips to 

 the Flexor brevis digitorum, terminates in a tendon which is in- 

 serted into the hallux. The Flexor accessorius acts, therefore, 



