1871.] PROF. W. H. FLOWER ON THE AUSTRALIAN CASSOWARY. 33 



bird, by the horny casque. It is not safe, however, to lay too much 

 stress on slight differences in the shape of this appendage, as it 

 varies not only with age, but also considerably in the three (all 

 perfectly adult) examples of ft yaleatus examined. All of these, 

 however, agree in having the apex of the crest directed backwards, 

 in its having a long and strongly convex anterior border, and a 

 short, vertical or concave posterior border ; while in C. australis 

 the apex of the crest points rather forwards, and the borders are of 

 nearly equal length, the anterior being almost vertical and slightly 

 concave, and the posterior sloping forwards and upwards and heing 

 somewhat convex, as shown in the figure. The crest is also more 



Side view of skull of Camarius australis ; half the natural size. 



elevated vertically and more compressed, especially in its upper 

 part and towards the edges. The extent of the cranial surface from 

 which the hase of the crest springs is almost identical in both 

 species ; the bones involved appear to be the mesethmoid, the nasals, 

 Proc. Zool. Soc— 1871, No. III. 



