1896.] 



ANATOMY OF jDCHilOPUOBUS MAJOB. 



541 



from the works of Garrod", Fiirbringer ', and Gadow", and from my 

 own dissection of 1 odicipes cristatus. These observations only refer 

 to various species of Podicipes (P, cornutus, P. cristatus, P. minor, 

 P. novce hollandice). The diflferences between these forms and 

 JSchmopliorus are not great. The tendons of the tensor brevis 

 are, however, a little different, judging from the figure which 

 Fiirbringer (loc. cit. pi. 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 seamdariorum is not entirely 

 absent in other Grebes, but is rudimentary. I did not look for it 

 with a microscope in j^cJimophorus, so there may be a faint 

 rudiment. I could not find one, however, in P. cristatus. 



The syrinx of JEclmiopliorus (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 tho composition of which it appears to me 

 that the first bronchial semiring enters. In any case, if that be not 



Pig. 2. 



Fig. 1. — Syrinx of Mchmophorus : i, intrinsic muscles. 

 Fig. 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 

 ring is the second bronchial. The intrinsic muscles are attached to 

 the third tracheal ring in front of the tracheo- bronchial box. The 



' Collected papers passim. 



' ' UnterBuohungen zur Morph. u. Syst. der Vogel.' 



' "Avea " in Bronn's ' T'lier-Eeioli,' 



