. The Ibis . he Leyden Museum, vol. x. p. 109. Anatomy of the Hoaizin. 285 tare of the subject, and the work of previous writers appearsto he entirely ignored ; nor can this omission be excused onthe ground that Dr, Youngs description is so complete asto render useless any reference to older writers. The syrinx,w liich has been well figured (in two aspects) and described byProf. Garrod*, is represented by a small f and very inaccuratedrawing. The only description of the windpipe is as follows(p. 172) :—The wdndpipe, after it enters the chest, givesoff on each side one small branch, and passing
. The Ibis . he Leyden Museum, vol. x. p. 109. Anatomy of the Hoaizin. 285 tare of the subject, and the work of previous writers appearsto he entirely ignored ; nor can this omission be excused onthe ground that Dr, Youngs description is so complete asto render useless any reference to older writers. The syrinx,w liich has been well figured (in two aspects) and described byProf. Garrod*, is represented by a small f and very inaccuratedrawing. The only description of the windpipe is as follows(p. 172) :—The wdndpipe, after it enters the chest, givesoff on each side one small branch, and passing on terminatesinto {sic) two tubes.^ Apart from the error contained inthe first sentence (the branches are presumably the sterno-tracheal muscles, but are represented in the plates as if theywere actually branches of the trachea itself !), it seems a wasteof space to state that the trachea divides into two bronchi;for this fact is not of any interest as a contribution to the structure of the genus! Fiff. Opisthocomus Manus of Chick from outside: i, pollex ; ir, index. JVinff of young Opisthocomus. The external characters of the wing of the young bird are illustrated in figs. 1 and 2 of the plate which accompanies Dr. Youngs paper, and in woodcut, fig. 2, of the present article. The most remarkable point in the structure of this * Notes on Points in the Anatomy of the Hoatzin {); P. Z. S. 1879. p. 109, and Coll. Papers, p. Loc. cit. pi. viii. fig. G. 286 Mr. F. E. Beddard on the organ is the presence of a well-developed curved nail uponboth the pollex and the index. In the large number of spe-cimens which I have examined the relative positions of thesetwo digits differ very considerably ; sometimes they areparallel to each other, in other specimens opposed, and thereare various gradations between these two extremes. Thecondition of the specimens quite bears out Dr. Young^s state-ment that both the thumb and [first] finger have the
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