140 Cincinnati Society of Natural Fiistory. 

Fig. 1.—One-third natural size. Upper jaw with incisors: a, imbedded portion of 
incisors; b, straw passing through infra-orbital foramen; c, straw through upper 
posterior nares; d, straw through lower posterior nares; h, median partition; m, 
malar process; 7, base of nasal opening. 
The head of this specimen is very incomplete as regards the 
cranial region—the whole of the occipital, parietal and frontal 
regions of the cranium being wanting. Almost the only portions 
are the maxillaries, the premaxillary, palatine, right nasal, vomer, 
and enough of the forward portion of the sphenoid to show dis- 
tinctly the anterior portions of the pterygoid fosse. But the 
broken and defective condition of the skull throws some light on 
the internal structure. The nasal, frontal and ethmoid bones 

Fic. 2.—One-third natural size. Right nasal: a, anterior end. 
being absent, except the right nasal, which is detached, the finely 
developed incisors are exposed as they curve backward through 
the premaxillary entirely to their bases. ‘The full depth of the 
sockets is thus shown, and the hollow bases of the incisors are suffi- 


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