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Show 496 MR. P. CHALMERS MITCHELL ON THE [June 19, these the three tendons arise in a very definite manner. That of the fourth digit is always the most superficial; in every case it had a separate connection with each of the three heads. That of the third digit lies next below ; it had origin in all but one case from each of the three heads. The exception is the Pheasant, in which the outer head was absent, while the head from the ambiens was much more muscular than in the others. The tendon of the second digit comes from the deepest part of the muscle and lies nearest the fibula. In Aramides, in Psophia, and in Leptoptilus it arose from each of the three heads ; in Ecematopus it arose from the ambiens and the inner head ; in all the others from the ambiens and the outer head, as in the figure of the Crane. Thus in each of the nine birds the ambiens is connected with the perforated flexor of each toe. Dissection of the right leg of Balearica chrysopelargus, seen from the outer side. gastr. Outer head of gastrocnemius, cut and reflected. Biceps. Biceps, cut across shortly after its passage through the sling. 1. Flexor longus hallucis. 2. Flexor perforatus indicis. 3. ,, „ medii. 4. ,, ,, annularis. 2'. Flexor perforatus et perforans indicis. 3'. „ „ „ „ medii. In Nycticorax gardeni, as may be seen from fig. 2 (p. 497), a condition very closely resembling that in the Crane is present, but |