In the dissecting-room of this School during the past winter session we have obtained four examples of the long accessorius muscle. We have thought it advisable t o place these on record as they form a useful summary of the various origins of this muscle, when present, and of its relation to the accessorius muscle of the sole (M. quadratus plantae).Many previous observations on this muscle are to be found, in brief, in the accounts by Le Double (1) and Testut (2). We have, however, endeavored to review the subject afresh, in order to present in concise form the views a t present held regarding the origin of this muscle. Our personal investigations have been carried out on twenty-five cadavera, among which only two revealed the presence of the muscle. We have also dissected the myology of the hindlimb in the following animals: Macacus rhesus, Tatusia peba, Alligator mississipiensis.In this way we hoped to obtain information of assistance in interpreting the muscular arrangement in homo. We do not propose at present to publish the result of these dissections, but simply to extract parts which have direct bearing on the subject under discussion. We would acknowledge our indebtedness to Dr. T. Wingate Todd for placing the material a t our disposal and for assistance throughout the investigation. The specimens of Macacus rhesus were generously presented to the Department by the authorities of the Cleveland Zoological Gardens. 341

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