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Show 1896.] ANATOMY OF JECHMOPHORUS MAJOR. 541 from the works of Garrod1, Fiirbringer2, and Gadows, and from m y own dissection of 1 odicipes cristatus. These observations only refer to various species of Podicipes (P. cornutus, P. cristatus, P. minor, P. novae hollandice). The differences between these forms and Mchmophorus are not great. The tendons of the tensor brevis are, however, a little different, judging from the figure which Fiirbringer (loc. cit. pl. xix. fig. 4) gives of Podicipes cornutus. In that Grebe the tendon of the brevis and the recurrent tendon, the longus, appear to form a continuous sheet of tendon covering a good deal of the patagium. In P. cristatus the biceps slip joins the brevis tendon. The biceps is two-headed in some other Grebes, but single in P. cristatus. The expansor secundariorum is not entirely absent in other Grebes, but is rudimentary. I did not look for it with a microscope in JEchmophorus, so there may be a faint rudiment. I could not find one, however, in P. cristatus. The syrinx of Mchmophorus (fig. 1) has a very incomplete bronchidesmus, a very wide space between the two bronchi existing above its anterior edge. The last two tracheal rings are fused to form a long box, into the composition of which it appears to m e that the first bronchial semiring enters. In any case, if that be not Fig. 1. Fig. 2. Pig. 1.-Syrinx of Mchmophorus: i, intrinsic muscles. Pig. 2.-Syrinx of Tachybaptes: i, intrinsic muscles. so, the first bronchial semiring has the unusual relations shown in the drawing, which are perfectly consistent with the belief that the S?g*.? t ? e second bronchial. The intrinsic muscles are attached to the third tracheal ring in front of the tracheo-bronchial box. The Collected papers passim. ' Untersuchungen zur Morph. u. Syst. der Vogel.' 3 "Aves" in Bronn's ' Thier-Reich.' |
