PROFESSOR OWEN ON THE GENUS DINORNIS. 275 



Fig. 4. Proximal ends of the three metatarsal bones not united together at this part. 



5. Side view of the tarso-metatarsal bone of the Dinornis struthoides. 



6. Side view of the tarso-metatarsal bone of the Dinornis didiformis. 



7. A transverse section of ditto, at the part corresponding with the three separate 



metatarsals of the young Dinornis giganteus, fig. 4, 



PLATE XXIX. 



Internal stnicture of certain bones. 



Fig. 1 . Section of the femur of Dinornis didiformis, natural size : h, an accidental de- 

 pression at the back of the cervix, not leading into the interior medullary 

 cavity ; i, the depression in the popliteal space, without any opening into 

 the interior of the bone. 



2. Section of the femur of an Ostrich, half the natural size : h, the orifice and 



oblique canal conducting into the interior pneumatic cavity of the bone ; 

 i, the outlet of the same cavity in the popliteal space. 



3. Section of the femur of the Apteryx, in which no air is admitted into the me- 



dullary cavity ; natural size. 



4. Section of the tibia of the Apteryx, natural size. 



5. Section of the tarso-metatarsal bone of Dinornis didiformis, natural size : 



h. the obliterated line of union of the tarsal epiphysis. 



PLATE XXX. 



Restoration of the Dinornis giganteus, and scale of altitude of that and other species, 

 according to the standard of the Cassowary. 



Fig. 1 . The three principal bones — femur, tibia, and tarso-metatarsus — of the hind 

 extremity of Dinornis didiformis. 



2. Skeleton of Casuarius galeatus (Pander & D' Alton). 



3. The femur, tibia, and tarso-metatarsus of Dinornis struthoides. 



4. The femur, tibia, and tarso-metatarsus of the Dinornis ingens. 



5. The pelvis, femur, tibia, tarso-metatarsus, and restored outline of the Dinor- 



nis giganteus. 



VOL. Ill PARTIII. 2o 



