357 



as in the Ostrich : in no bird are the muscular ridges and tuberosities so 

 strongly developed on the posterior part of the shaft : the orifice of the 

 medullary artery is at the middle of this surface. The popliteal space is 

 deeply excavated. There is a rough deep oval depression at the upper 

 and back part of the outer condyle. 



1570. A cast of the left tibia of the Dinornis ingens. It measures two feet 

 five inches in length, and five inches and a quarter in circumference at 

 the middle. It presents a closer correspondence in its proportions and 

 configuration with the tibia of the Dinornis giganteus, No. 1566, than 

 with that of the smaller species Dinornis didiformis and Dinornis otidi- 

 formis. It presents all the characters of the bone of a mature or old 

 bird : the external ridge at the proximal extremity is relatively less pro- 

 duced, but it is thicker and stronger than in No. 1566 : the difference of 

 size appears too great to depend on a sexual variety in this respect. The 

 femur No. 1569 bears the same proportions to the present tibia which 

 the shaft of the femur No. 1564 does to the tibia No. 1566. 



The original of this cast is in the Geological Museum at Oxford. 



Presented by the Rev. Dr. Buckland, F.R.S. 



1571. The left femur of the Dinornis struthoides, Owen. This bone measures 

 eleven inches in length and five inches and a half in circumference at 

 the middle of the shaft. Like the femur No. 1569, the parietes at 

 the back part of the proximal end of the bone are entire and imperforate 

 as in the Apteryx, and the weight of the bone accords with this evidence 

 of the absence of the air-cells which penetrate the medullary cavity in 

 the Ostrich, Cassowary, Rhea and Emeu. 



] 572. The shaft of the right femur of apparently the same individual Dinornis 

 struthoides. 



1573. The shaft of the left femur of a younger individual of the Dinornis stru- 

 thoides. This femur corresponds with the femur No. 1571 in its general 

 form, its ridges and tuberosities ; but these are less strongly developed, 

 and the manner and extent of abrasion of both proximal and distal arti- 

 cular surfaces well accord with the supposition of their having been in 





