RALLIDs. | OSTEOLGIA AVIUM. [Ratu x. 
Ocypromus, Wag, 
— Sylvestris, Sclat. 
Cranium of moderate length; a transverse indention at the base of the bill. 
Nostrils long, oval. Lacrymal bone elongated over the orbits. Orbital septum with a 
large foramen. Occipital ridge prominent. Palatine bones rounded behind; edges 
curved downward, narrowed suddenly anteriorly to a mere strip of bone. 
Sternum broadest anteriorly, narrowed in the middle again; slightly expanded at 
posterior margin, with a deep fissure on each side. 
Pelvis anteriorly ; deep and arched; posterior half, with a deep and broad channel 
down the centre; deep curved on each side of the caudal vertebre ; divisions of the 
sacral vertebre apparent. 
- Ribs long, thin. Stylyform process very long, extending over two ribs. 
Furculum without any process as the ia of the rami. 
Coracoids of moderate size. 
Scapule long, slightly arched, pointed at their ends. 
Wing bones short. 
Leg bones moderate; metatarsus short. 
Measurements. 
Tenths. Tenths. 
Leneth of humerus. 2 . «2 ay» 20 Breadth of anterior Rcrbe 
envinropulua, <4, eit a 2h i568 Matson dittony Saa9 Weyl elon EO 
Length of metacarpus . . . . 12 Depihvoiwkeely ral iA) tenet 40,13 
Length offemur . . . . . . 24% Kenetisonhcadis 2 . 2 > Ya 84 
Eeneth oktibia . 5 . § « « 3 breadtimon head (5 .)'8' 5 4 4 9 
Length of metatarsus . . . . 183 emethe ot pelvis) 2 fe 4 “wey yee 
hengthotisternum. 2 > . « 4 IY Breadthvor pelvis « « .\. 4 = 9 
Breadth of posterior margin . . 53 
Illustrations. 
Suppt. 2, pl 17. Details, pl. 17, A 
When I described the skeleton of Rhynchotus I had not the skeleton of any large 
rail; since that I have obtained one, Ocydromus sylvestris, which I now figure. The 
sternum is similar, except that of Ocydromus has two foramina on the posterior margin, 
which Rhynchotus has not. The metatarsi of Ocydromus are much shorter than those 
of Rhynchotus. The cranium and pelvis are similar. The palatine bones are more. 
truncate at hinder extremities in the latter than in the former. 
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