378 PROFESSOR OWEN ON THE GENUS DINORNIS. 
1 & iv in Aptornis is wider and deeper than that between 11 & u. ‘The grooved or 
trochlear character of each condyle is well marked. 
On the whole, the inference seems legitimate that we have in the metatarsus of 
Aptornis a bone extremely modified for “rasorial” functions upon a porphyrian or 
* yalline” type. 
Table of Admeasurements. 
Aptornis defossor. _Aptornis otidiformis. 
Skull: in. lines, in. lines. 
ONE GH) chasccc cris rapt fe. ee > MME eee eels wie cian eberae te Ioeeier 7f 2 6 2 
Breadth (across paroccipitals)\.. 4.1. es-+cess+ sass estes 3 3 2 9 
iBreadthy(acrossipostérontals) ann came nee eeciee settee oe 3 2 2 10 
Breadth (across temporal foss@) .............0000++eeeeee: 2 3 1 1 
Breadth of base of upper mandible at fore part of orbit ...... 1 6 1 3 
Breadth of middle of upper mandible...................... it d 1 1 
Breadth of fore end of upper mandible .................... 0 7 0 6 
Length of cranium to coalesced premaxillary................ 2 6 2 2 
enethyofpromaxillanye Jectoite is sie taes cin romani ie eer te ts 5 0 4 3 
From the fore part of external nostril to the end of the pre- 
21S HE oth cOHOeon DOO Siiotcs JomSmodancannossGecttes 2 9 2 3 
From the superoccipital ridge to the lower border of the fore 
pasilar;faberosiGion::.. Frits. stlashepiassoRaiiuis easteeee Ga vera 2 6 2 1 
Femur. 
een Ft i a eve eros pio mdntoeens alive Mate Meare Sioeets oie, oatere aes ets 7 6 6 2 
Breadth of proximal end, in the axis of the neck ............ 2 2 1 9 
Breadth of distal end, across the condyles ...............+-. 2 2 1 9 
Cireumference of middle of shaft ...........0seeseeeecees 2 9 2 3 
Tibia. 
LEST 1 Seas sie OSes IS OS AOIOIGE SBIAE A amauta Chie me 1G) 3 8 9 
Breadthrofproxaumalvend 2's vir we vis..'s tie istne cemeteries « 2 3 1 9 
Breadth ofidistaliend, 6... cei sahte oe Gave Ri bgteaioes wie eee ty 710 1 3 
Circumference of middle of shaft ...............-.00000:- 2 6 Le) al: 
Metatarsus 
Weenie th evs tcc ev crn ousite wetccac Pele casicisices eee ee eRe Eee 4 4 3 20 
Breadth (transverse) of proximal end............ 0.0000 eee 1 8 1 5 
Breadth (transverse) of distalend ...........cseesecreeves 1 9 1 6 
Breadth (transverse) of middle of shaft .................05. O12 0 8 
Breadth from fore part of proximal end to back part of caleaneal 
PIOCESS! jayag ey’ 5 se i og aA syegslls valine 5, aNaslo-k nleMeteteta as eee eee « 1 6 iW 4 
