12 Osteology of Porzana Carolina. 
The clavicular heads of this bone are scarcely at all pro- 
nounced ; indeed, this element is comparatively very frailly 
constituted, and not much curved in the antero-posterior 
direction. 
I believe, with the exception of certain portions of the 
skull, and vertebra beyond the pelvis, the entire skeleton 
of Porzana is a non-pneumatic one. 
We find the sternwm assuming a very quaint form 
among these short-billed Rails ; it being long and narrow, 
profoundly cleft, once on either side of its xiphoidal 
extremity, and with a deep notch occupying the anterior 
border above the manubrial site (Figs. 6 and 7). 
Fig. 6. Right lateral view of sternum Fig. 7. Pectoral aspect of ster- 
of Porzana carolina, x 2. From same num of Porzana carolina, 4, x 2. 
specimen as before. Same bone as shown in other fig- 
ures. All the drawings illustra- 
ting this article are by the author 
from nature. 
The costal processes are prominent, while the borders of 
the same name which slope down behind them, bearing on 
either side the hamapophysial facets, occupy less than 
one-fifth the entire length of the lateral border in each 
case. 
Its keel is ample, and extends the full length of the 
sternal body. In front, its border is concave, and verti- 
