. Le journal américain de l'anatomie. condition un peu inadvance de ce que l'on trouve dans les monotrèmes et encore un peu d'belowwhat est trouvé dans de tels un mammifère comme l'opossum, en ce sens qu'il n'showany antihrachial la différenciation de la partie de l'flexor sublimis.je prendre une telle condition pour la comparaison avec les formes inférieures plutôt thanone où la partie de l'avant-bras sublimis est différenciée, parce que ce muscle est propre à la série des mammifères et possessesAvithin cette série un développement assez compliqué qui maymore idéalement être considérés plus tard. L'arrangement de la m

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. The American journal of anatomy. condition a little inadvance of what is found in the monotremes and yet a little belowwhat is found in such a mammal as the opossum, in that it fails to showany differentiation of the antihrachial portion of the flexor sublimis.I take such a condition for comparison with the lower forms rather thanone in which the forearm portion of the sublimis is differentiated, because this muscle is peculiar to the mammalian series and possessesAvithin that series a somewhat complicated development which maymore conveniently be considered later on. The arrangement of the muscles in the somewliat hypothetical condi-tion may be supposed to be as follows. Superficially upon the ulnarside of the forearm is the flexor carpi ulnaris (Fig. 4, F. C. U.) arisingby two heads, one from the internal condyle of the humerus and theother from the olecranon process, and inserting below into the ulnarside of the carpus. In close proximity to this muscle is the epitrochleo- 188 The Phvlofrenv of the Forearm Flexors. anconeus, also arising from the condyle of the humerus and insertinginto the olecranon process. Upon the radial side there is aflexor carpi radialis (F. C. K.), extending from the internal con-dyle to the base of one or moreof the radial metacarpals, and apronator radii teres, again fromthe condyle and inserting a vary-ing distance down the outer sur-face of the radius. The median portion of thearm is occupied by (1) a palmarislongus (P. L.), extending fromthe internal condyle to the pal-mar aponeurosis, and (2) a largemass, composed of several more orless distinct portions and whichmay be termed the flexor com-munis digitorum. The consti-tution of this muscle has beenadmirably elucidated by Windle(1890), and I propose to followclosely his description of it, basedas it is upon a profound and critical analysis of its various components.My observations have confirmed his for the most part, the only modifi-cation which I shall make being the omission for

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