=I 
PROFESSOR OWEN ON THE GENUS DINORNIS. 15 
shorter than in the fourth (fig. 12, p/). ‘The neural arch attains its greatest length in 
the twelfth vertebra. The connecting bar (fig. 16, 4) of the parial neural spines is 
slightly raised, and is better defined before and behind by the rough pits for the 
elastic ligaments than in some of the antecedent cervicals, The breadth of the neural 
platform across the postzygapophyses is relatively greater, in a small degree, than in 
the antecedent cervicals; yet their articular surfaces (fig. 15, pz) remain longer in 
proportion to their breadth. ‘The perforation of the interzygapophysial bar continues. 
The longitudinal ridges of the pleurapophysial plate (fig. 15, p/) are more pro- 
minent ; the upper one assumes more the character of a metapophysis (ib. m). 
The cervical vertebra of Dinornis giganteus, figured of the natural size in plate 40, 
vol. iii. of the ‘ Zoological Transactions,’ is the answerable one to the twelfth in the 
huger representative species of the South Island of New Zealand. It is less broad in 
proportion to its length, and thus conforms to the more slender metatarsals cha- 
racteristic of D. giganteus of the North Island. The transverse connecting bar of the 
neural spines, marked s in fig. 5 of the plate 40, rises nearer to the summits of the 
parial divisions; the ridges continued from these, forward, converging to the fore 
margin of the neural arch, are longer and broader than in Dinornis maximus ; the 
hollow behind the neural spines is also broader. 
The thirteenth and fourteenth vertebre in Dinornis are most nearly matched by the 
sixteenth and seventeenth in Struthio camelus, in which species the eighteenth vertebra 
FOURTEENTH VERTEBRA (4 natural size). 
Fig. 17. 
I 
aes 
/\ 
Al 
ae 

Pe Wz. 
Aspect. 
Fig. 16, hemal (ventral). 
(fig. 41 of Mivart), like the fifteenth in Dinornis (fig. 19), first changes its parial or 
double for a single hypapophysis, hy. My figure 17 may therefore be contrasted with 
/ 9 
“a 
