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Show 1896.] ANATOMY OE THE HOATZIN. 625 lost in the tendon over the knee, through which, in the normal condition, it passes. I dissected carefully for the ambiens in each lee of two of m y specimens. In one case the ambiens was completely absent above the knee, and there was no trace of its tendon in the fasciae and tendon over the knee. But in each of these legs(as shown in fig.4, p. 626) a strong round ligament left the fibula, in the position in which the ambiens tendon of a bird with a normal ambiens crosses the fibula. This tendon passed down and sent a branch to each of the three perforated flexors of the Fig. 3. Thigh-muscles of Opisthocomus cristatus ; posterior view. Sart., Sartorius. Vast.int., Vastus internus. Adduc, Adductors. Semitend., Semitendinosus. Semimem., Semimembranosus. G.t., Gastrocnemius, tibial head. G.m., Gastrocnemius, middle head. G.e., Gastrocnemius. external head. Sol., Soleus. Flex.com., Flexor communis digitorum, I. Flexor longus hallucis. digits. In a second specimen I found the ambiens above the knee. The tendon was lost at the knee-joint, but a rudiment slightly different from that in the first case was present in each leg below the knee. From the fibula, immediately distal to the • attachment of the biceps tendon, three fibrous slips passed respectively to the perforated flexor muscle for the second, third, and fourth digits. It is well known that Garrod regarded the |