Hutton. — On Anomalopteryx antiqua. 15 



a depth of 23mm.; so that the anterior width is less than the 

 depth. The anterior surface is not so oblique as is usual 

 in the other small species of moa, but makes almost a right- 

 angle with the outer surface. It is also directed inwards, 

 well within the inner edge of the middle trochlea (fig. 4) . The 

 most remarkable character, however, is its flatness behind 

 (fig. 5), the posterior process, which is so large in all other 

 moas except Palapteryx dromioidcs, being here quite small. 

 The trochlear groove is slight. 



The middle trochlea is considerably broader than the inner 

 one, its width being probably about 28mm., but it tapers off 

 rapidly so that its distal width is only about 19mm. Its depth 

 is 26mm. It does not project so far forwards as in most other 

 moas. 



The intertrochlea.r gorge is broad and does not narrow so 

 much at its entrance (figs. 3-4) as in all other moas except 

 Cela carta. Its width at the entrance is nearly half that of 

 the inner trochlea. 



Supposed Femur. Plate IV., fig. 6. 



This is nearly cylindrical, the greatest and least diameters 

 being 28mm. and 26mm. It is remarkable for the thickness 

 of the bony wall, the diameter of the medullary cavity being 

 only about 8mm. or 9mm. This great thickness of the bony 

 wall makes it doubtful if the bone belongs to a bird at all. 

 The only bones of the moa which have so relatively small a 

 central cavity are the toe-bones, and these are always flat on 

 the undersurface. It is also too large for a toe - bone of 

 A. antiqua, while its diameter is about what we should expect 

 in the femur of that species. As the bone has disappeared 

 it is impossible now to make a microscopical investigation to 

 test its avian or reptilian character. 



Affinities of the Species. 

 In the high intercondylar ridge our species resembles 

 Anomalopteryx didiformis, Mesoptcryx didina, and Pachy- 

 omis (?) geranoidcs, and differs from Cela curta. In the 

 sinuated anterior margin of the proximal articular surface 

 it most resembles A. didiformis and P. geranoidcs, but in these 

 species there is usually only a single concavity on the inner 

 side of the intercondylar ridge. In the absence of a longitu- 

 dinal ridge on the inner margin it resembles P. geranoidcs, 

 but this ridge is often absent in A. didiformis and C. curta. 

 In the high ectocondylar margin it most resembles M. didina 

 and P. geranoidcs. In the small inner hypotarsal ridge it 

 approaches Emeus crassus, but A. didiformis sometimes has 

 the inner ridge less than the outer. 



