274 



On motion of Dr. Chas. T. Jackson, it was voted that 

 the current volume of " Proceedings," containing the articles 

 in question, together with such other papers as it might be 

 in the power of the Society to send, be transmitted to M. 

 Perrey. 



The President exhibited a specimen of small teeth, 

 probably of a recent fish, found in a cavern in one of the 

 towns on the south shore of Lake Erie, brought to the 

 meeting by Mr. Allen. 



Prof. Jeffries Wyman gave an account of the dissection 

 of a Black Chimpanzee, (Troglodytes niger,) one of the 

 collection presented by Dr. J. V. C. Smith. The dissection 

 was made particularly with reference to a comparison of the 

 muscular system of Troglodytes with that of man. The 

 following were some of the deviations from the arrangement 

 of the corresponding muscles in man. 



The Deltoid arose from the whole base of the scapula below 

 the spine, in addition to the origin which it has in man. 



A Trachelo-clavicular muscle was present on each side ; this 

 is never found in man. 



The Pectoralis Minor was inserted by a slender tendon into 

 the great tuberosity of the humerus, instead of into the coracoid 

 process, as in man. 



The Supinator longus was more powerful than in man, being 

 fleshy to within an inch of its insertion. 



The Flexors of the wrist were more powerful than in man. 



The Long Extensor of the thumb was very slender. 



The Short Extensor of the thumb was inserted into the base 

 of the metacarpal bone. 



* The Extensor Ossis Metacarpi or Long Abductor was inserted 

 into the Trapezium. 



The Flexor longus PoUicis did not exist ; but in its place there 

 was a small and delicate tendon from the flexor communis 

 profundus. 



