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Show 234 MR. P. E, BEDDARD ON DISSURA EPISCOPUS. [Feb. 4, with special lung-muscles, as can be seen in dissections of Nycticorax and Cancroma. In the former bird there are four pairs of muscles arising from the rib, each individual muscle, of course, from a single rib. But in addition to these, two muscles arise on each side from the bronchus just w here it enters the lung-substance and fan out over the aponeurosis; they both spring from the posterior surface of the bronchus and diverge slightly from each other to their insertion. Fig. 3. Diagram of the syrinx of Leptoptilus (see p. 232). The origin of these muscles from the bronchus is interesting in view of a very similar relationship of lung-muscles to bronchi which I described some years ago in the Condorl; but in the latter bird the muscles are attached at the distal end to the parietes and not to the lung-surface, though, as in Nycticorax, they arise from the bronchi. In Cancroma five pairs of ribs border the area occupied by the lungs. From the last four of these arise slender slips of muscle which passing forward end upon the pulmonary aponeurosis The bronchi in this Heron have not the broncho-pulmonary muscles of Nycticorax. It seems, therefore, that we have here a character which serves to distinguish the Ardeidae from the Ciconiidae. The Syrinx of the Ardeidce.-Though the syringes of such of the Ardeidse as I have been able to examine differ but little among themselves, it m a y be useful to give a short account of what I have ascertained, since but little, so far as 1 a m aware, has been published on the matter. 1 " Notes on the Anatomy of the Condor," P. Z. S. 1890, p. 146, woodcut fig. 3. |
