GALLIFORMEs. 43 
Suborder 32. CRYPTURI. 
The Tinamous are perfectly unique in the form of the sternum, which has a narrow 
median xiphoid process to support the keel, and on each side a still narrower xiphoid 
process, the three processes occupying four fifths of its entire length. 
They may otherwise be diagnosed in various ways :— 
A. The keel of the sternum is well developed. B. The cartilage which connects the 
ilium with the ischium behind the acetabulum is not ossified. 
This diagnosis is complete, as is also the following :— 
C. The vomer coalesces with the maxillo-palatines in front, and with the pterygoids and 
palatines behind. D. The feather-tracts are well differentiated from the bare 
tracts both on the upper and under parts. 










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The Tinamous appear to form a link between the Galline and the Apteryges. The 
sternum is quite unique, but it approaches nearest to that of the Galline, and is as far as 
possible from that of the Ratite. In their pterylosis the Tinamous are Galline, and not in 
the least Struthionine. On the other hand, the pelvis and the palate have certain charac- 
teristics which are only to be found in the Struthioniformes, 
The inference to be drawn from these facts appears to be that the Struthioniformes are 
not so widely separated from the Galliformes as some ornithologists suppose them to be. If 
these two subclasses were thrown together, the diagnosis ‘‘ Young born covered with down 
or feathers ; palate not desmognathous ; front plantar not leading to hallux,”’ would cover 
them both. 
