PROFESSOR OWEN ON THE GENUS DINORNIS. 19 



DESCRIPTION OF THE PLATES. 

 PLATE I. 



Restoration of the foot of Palapteryx robustus. 



Fig. I . Front view of the bones. 



I . Detached metatarse of the rudimental hallux. 



II. Distal trochlea of entometatarse, or that of the second toe: its three pha- 

 langes are numbered 1, 2, 3. 



III. Distal trochlea of mesometatarse, or that of the third toe : its four phalanges 



are numbered 1, 2, 3 and 4 : a side view of the last is added in outline. 



IV. Distal trochlea of ectometatarse, or that of the fourth toe : its five phalanges 



are numbered 1, 2, 3, 4, 5. 

 Fig. 2. Outline of the proximal end of the compound tarso-metatarsal bone. 



3. Distal ends of the trochleae of the three metatarsal elements, numbered as in 



fig. 1 : below these are the proximal articulations of their respective prox- 

 imal phalanges. 



4. A side view of the metatarse of the hallux, showing its characteristic twist. 



5. Back view of the metatarse of the hallux. 



6. Distal ends of the trochleae of the three metatarsal elements of the compound 



bone of the Cassowary (Casuarius indicus): below these are the proximal 

 articulations of their respective proximal phalanges. 



7. Outline of the bones of the foot, front view, of an Ostrich {Struthio camelus) : 



the homologous phalanges with those of the Palapteryx are indicated by the 

 same symbols. 



All the figures are of the natural size. 



PLATE II. 



Restoration of the foot of Palapteryx dromioides. 



Fig. 1. Front view of the bones. Only the distal ends of the coalesced metatarsals 

 are figured. The bones of the toes are indicated by the same symbols as 

 in PI. I. 



2. A side view of the ungual phalanx of the third toe. 



3. Back view of the femur oi Notornis Mantelli. 



4. Front view of the tibia of ditto. 



5. Back view of the tarso-metatarse of ditto. 



