== 
th Mi 5, 
ON THE TRACHEA OF CERTAIN DUCKS. 231 
the Faliguline affinities of the genus; and the trachea presents points Page 154, 
of superficial similarity to that of the last-described bird, Sarcidiornis 
melanonota, as will be seen by a comparison of the accompanying draw- 
ings (figs. 1-5) of the lower portion of the windpipes in the two. In 
the female (fig. 3) there is no lateral diverticulum, the syrinx being 
Fig. 4. Fig. 5. 
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Fig. 4. Lower part of trachea of Rhodonessa caryophyllacea of (front view). 
Fig. 5. Ditto (side view). 
simple. The lower end of the trachea is hardly contracted at all. 
There is, however, aslight thinning of the anterior portions of some of 
the inferior tracheal rings, as in the female of Sarcidiornis melanonota, 
though to a less extent—a small, transverse, anterior fenestra being 
the result. In the Rhodonessa the syrinx proper is nevertheless 
differently constructed, the last five or six tracheal-rings being con- 
solidated together, the fenestration being situated higher up; whilst 
in the Sarcidiornis the fenestration of the unanchylosed rings con- 
tinues as low down as the bronchial bifurcation (vide figs. 3, 4, and 5).. 
In the male Rhodonessa caryophyllacea (figs. 4 and 5) the lower 
portion of the trachea is less capacious than a little higher up, where 
a slight fusiform dilatation occurs. Above the large syringeal box 
there are in front 15 transverse fenestre formed between the thinned 
tracheal rings, as in the Sarcidiornis and Harelda. Below them the 
syrinx is formed by a considerable dilatation in two directions—one to 
Mpyes « 
