86 0. C. Marsh—Characters of the Odontornithes. 
The vomers are separate, as in lizards and a few modern birds. 
In the pelvic arch, the ilium, ischium and pubis are free at their 
distal ends, as in the Emu, and the acetabulum is perforated 
only by a moderate foramen. : 
The scapular arch of Hesperornis is represented in plate V, 
figure 1. Its position in the skeleton is shown in the restora- 
tion, figure 2. 
The scapula is long and slender, and has no acromial process. 
The clavicles are separate, but meet on the median line, as nm 
some very young existing birds. The coracoids are short, and 
much expanded where they join the sternum. The latter has 
no distinct manubrium, and is entirely without a keel. The 
wings were represented by the humerus only, which is long 
and slender, and without any trace of articulation at its distal 
end. Its position was close to the ribs, and it was probably 
nearly or quite concealed beneath the integuments, as 12 
This rendered the rudimentary wings of no possible 
service in flight or swimming. 
Baptornis advenus, gen. et sp, nov. 
bone from the same geological horizon. This specimen, 
although pertaining to a bird not fully adult, is in excellent 
betel and is so characteristic that it may be readily 
istinguished from any forms already described. 
inner metatarsal, a short distance above the articulation. AS 
in Hesperornis, there are no canals or grooves for tendons 0D — 
the region face of the proximal end. 
The principal dimensions of this tarso-metatarsal are 4 
follows :— 
Bniite eegth ce a, 7650" 
Transverse diameter of proximal end .____.._......---- ye 
Antero-posterior Cismiever 8° 
Length of secoed Mietatarteet 2 64°5 
Dength of third tinetatirr 72° 
Length of fourth metatarsal 
Antero-posterior diameter of distal articulation of second 
metatarsal : 
ae ee ee 0 te we et eR law Se ee ee i eh gl we a ee a 
———S we eee ee ee ee 
