353 



1563. The left moiety of a pelvis, bisected vertically and lengthwise, of appa- 

 rently the same species of Dinornis as the foregoing specimen. It differs 

 in the minor elevation of the spines of the seven anterior sacral vertebrae 

 and of the co-ascending plates of the iliac bones, and in the greater 

 breadth of the pelvis behind the acetabulum ; but these may be sexual 

 distinctions, as the correspondence in size, characters of maturity and 

 other particulars is almost complete. The cut surface exposes the di- 

 lated cavity of the sacral enlargement of the spinal chord, and shows the 

 internal orifices of the separate canals of the motor and sensitive roots 

 of the spinal nerves. The remains of the lofty spines of the several 

 anchylosed sacral vertebrae exhibit their conversion, as it were, by 

 extreme antero-posterior compression, into transverse plates, slightly 

 radiating as they ascend, and connecting like tie-beams the iliac plates 

 with each other and with the sacrum : their interspaces are occupied by 

 a loose cancellous texture. The thin neural arch is expanded vertically 

 and transversely at the interspaces of the origins of the spinal lamina?, 

 and gives an undulating form to the roof of the spinal canal. 



Presented by William Cotton, Esq., F.R.S. 



1563'. A corresponding section of the pelvis of a young Emeu (Dromaius 

 ater), showing a smaller proportional expansion of the spinal canal for 

 the enlargement of the chord whence the nerves of the legs originate, 

 and the more marked difference in the form and proportions of the iliac 

 plates, especially behind the acetabulum. 



Presented by Prof. Owen. 



1564. The shaft of the right femur of the Dinornis giganteus*. 



1565. A model of the entire femur of the Dinornis giganteus, restored accord- 

 ing to the proportions of the foregoing diaphysis, and the characters of 

 the perfect femur, No. 1568. 



1566. The left tibia of the Dinornis giganteus: it measures two feet eleven 



inches in length and six inches and a half in circumference at the 

 middle of the shaft. 



* See the description of this part in the Transactions of the Zoological Society, vol. iii. p. 29. pi. 3. 



2 z 



