i 
144 
will be obvious in comparing fig, 1 with fig. 7, both of the natural BIE; but the 
difference in relative vertical extent of ilium and ischium, and relative size of the 
foramen (m) is to be noted. The parapophyses of the six anterior seeral yertebre abut 
against the ilia near the lower border of those bones. Below this abutment the first 
and second vertebre develop the cups for the tubercles of the last two pairs of movable 
ribs; the cups for the heads of these ribs are on the centrum, below the arignis. of the 
parapophyses. ‘These processes in the four following sacrals have coalesced with the 
ilia. Of the interapophysial vacuities (ib. fig. 2, d) the first and second are the largest, 
the other three smaller ones are subequal. 
Four interacetabular sacrals, in which the parapophyses are suppressed to give 
space to the prerenal lobes, are followed by four postacetabular sacrals, in which the 
parapophyses are resumed. Of these the first pair are slender, the second and third 
suddenly expanded, the latter (ib. ib. «w) apparently bifurcate; the fourth pair are 
short, and inclined backward; on each side of the sacrum these parapophyses coalesce 
with each other and with the ilia at their outer ends. The last sacral vertebra (ib. 
ib. 15) has not coalesced with the preceding, but appears to have been closely joined 
therewith, as the ends of its short and thick parapophyses combine with those of the 
fourteenth sacral to abut against the inflected parts of the ilio-ischial deck-like process 
(ib. ib. v). In the number of sacral vertebree (fifteen) Harpagornis agrees with Falco 
and Circus, and differs from Aguila; in the species of which I have examined the pelvis 
there are but fourteen sacral vertebre. The ischiadic foramen (m) extends relatively 
further beyond the postacetabular facet in [/wrpagornis than in Aguila; the foramen is 
relatively less than in Ctreus. 
The prerenal or interacetabular fossee (Pl. CV. fig. 2, £) are relatively narrower in 
Harpagornis than in Aquila or Circus, and more resemble those in Buteo. The pubic 
portion of the acetabulum does not extend so far outward as in Aguila. Buteo vulgaris 
and Falco communis, as well as Circus gouldi and Circus cyaneus, resemble Harpagornis 
in the vertically oval figure of the anterior orifice of the neural canal (ib. fig. 3, 2); in 
the smaller species figured (Circus pygargus, the Ring-tail or Montagu’s Harrier) this 
outlet is circular (ib, fig. 8), as in most species of Aguila. The iliac roofs (ib. fig. 3,7, f) 
of the long acetabular division of the pelvis are steeper in their slope than in Circus 
(ib. fig. 8) and most Eagles; the ilio-neural openings (ib. ib. o') have consequently, as 
Dr. Haast has remarked, “a greater yertical than lateral extent.” The parts of the 
pelvis in Pl, CV. are indicated by the same symbols as in that of Aptornis'. The 
gluteal processes (ib. fig. 1, h) appear to have been broken off in the fossil; they are 

bird in Gould’s * Birds of Great Britain,’ folio, part xii. 1867. In no animal does the size become so reduced, 
in the skeleton, as in the feathered class; with the above plate showing our native ‘ Harrier’ clothed in its 
plumage, some conception may be formed of the size of the extinct Hawk of New Zealand, magnified according 
to the proportions of figs. 1, 2, and 6, 7 in Pl. CY. 
' P. 125; Pls, LAXXIII. & LXXXTY,. 

