288 



ME. W. P. PYCEAFT ON THE MOEPHOLOGT AND 



Fig. 4. Lateral aspect of a portion of the skull of Casuarius sclateri, showing the 



frontal, nasal, and median elements of the casque. 

 Fig. 4 a. Dorsal aspect of fig. 8 a. 

 Fig. 4 b. Dissection of a skull of Casvarius sclateri=fig. 3 a, showing the mesethmoid 



and a portion of the ventral border of the median ossification of the 



casque interpolated between the mesial border of the anterior ends of the 



frontal. 

 Fig. 5. Lateral view of the synsacrum of a young Casuarius unappendiculatus after 



removal of the right innominate, to show the great height of the neural 



spines of the vertebrae. 

 Fig. 6. Lateral view of the synsacrum of an embryo Drommus novce-hollandiai (p. 212), 



prepared for comparison with fig. 5. Note that at this stage the neural 



spines have not yet risen above the centra of the vertebra?, but form only a 



series of lateral wings. 

 Fig. 6 a. Dorsal aspect of a portion of the synsacrum (fig. 6), to show more clearly 



that the neural spines do not rise above the centra as in the adult 



condition (fig. 5). 

 Fig. 6 b. Lateral view of the same pelvis (fig. 6), to show the separate elements 



of the innominate. 



Additional Letters. 



ant. = anti-trochanter. 

 f.c — frontal moiety of casque. 

 il. = ilium. 

 il.is.f. = ilio-ischiadie foramen. 



is. = ischium. 

 lb. 1-6 = lumbar vertebrae 1-6. 

 lb. 1-2 = lumbo-sacral vertebrse 1-2. 

 me.c — median element of casque. 

 ra.e. = nasal element of casque. 

 ub. = obturator fissure. 



o.p.fr.-= orbital process of frontal. 

 p. = pubis. 

 ^.;j. = pectineal process. 

 pubo-isch.f. = pubo-ischiadic fissure 

 s.c. = sacral vertebrse 1-2. 

 s.cd. = sacro-caudal vertebrse 

 s.^. = sacro-thoracic , ; 



v. = vestigial thoracic rib. 

 v.me.= ventral border of mesethmoid 



Syn sacral 

 vertebra?. 



PLATE XLV. 



Fig. 1. The buccal cavity of Rhea americana (p. 248), to show the large choanae 

 characteristic of the Palceognathce. 



Fig. 2. A neossoptile of Calodromas elegans (p. 162), after Pycraft, to show the large 

 aftershaft, equalling the main shaft in size, the complex rami of the main 

 shaft, and their production forwards into horny filaments resembling the 

 grooved ribbon-shaped bands of the young Ostrich (fig. 7). 



Fig. 2 a. A radius from the distal end of the main shaft. 



