632 Transactions. — Geology. 



In some doubtful cases I have been guided by the pro- 

 portionate numbers of the other bones of the leg. For 

 example, the tibiae in Dinoruis are more easily separated into 

 three groups than are the femora or the metatarsi, and so I 

 have taken them as a guide for the other bones. 



In my paper on the axial skeleton of the DinornithidcB -•' 

 I have given the generic characters of the vertebral column, 

 pelvis, and sternum ; in the present paper, therefore, I have 

 only mentioned those of the limb-bones ; and the table at the 

 end gives the average dimensions of these bones, in milli- 

 metres, for each species. 



Genus DINOENIS. 



The femur is distinguished by its short head and the flat 

 internal trochanterial surface. The shaft is usuallv round in 

 transverse section, but sometimes flattened from front to back. 

 The linea aspera is broken and often not well marked. The 

 popliteal depression is short and rather deep ; the two rough 

 tuberosities (for the heads of the gastrocnemius?) are separated 

 by a smooth longitudinal groove. The distal intercondylar 

 fossa is deep on the inside, shallow and broad on the out- 

 side. 



The tibia has a length of 12 to 13 times its width in the 

 middle of the shaft. The shaft is long and slender, often 

 slightly curved, and its antero-outer surface is convex in the 

 middle. The extensor bridge and its tubercle are directed 

 above the top of the outer condyle. 



The metatarsus has a length of more than 7 times the 

 width in the middle. The proximal articular surface has its 

 inner margin nearly straight and its outer margin rounded. 

 The second trochlea is short, not mucli longer than the fourth, 

 and its base is broader than that of the fourth. 



None of the scapulo-coracoids showed any trace of a 

 glenoid cavity, but several have a depression on the iujier side 

 at the anchylosis of the two bones, which might perhaps lead 

 to a mistake. The only cases of a supposed glenoid cavity are 

 those reported by Mr. H. O. Forbes,! and, as both these bones 

 are in his possession, I cannot offer an opinion on them. 



DiNOENIS MAXIMUS. 



D. maximus and D. altus, Owen. 



D. maxirmis (female only), Lydekker. 



D. maximus and D. validiis, Huttonv 



The number of leg-bones measured was — metatarsi, 30; 



* Trans. N.Z. Inst., vol. xxvii., p. 157. 



t Nature, 14tli January, 18'J2. 



