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 UINTA SELENODONTS 



107 



from the shape of the second phalanx it may be confidently inferred that the 

 extraordinary claw-like form characteristic of Agriochcenis had not yet been 

 developed, at least not in any such degree. It would be most important to 

 learn whether the unguals showed any tendency towards the assumption of 

 the claw-shape, but this must await future discovery. 



In the following table measurements of Protagriockcerus anncctcns and 

 Agriochcenis laiifrons are given together for purposes of comparison. 



MEASUREMENTS. 



The single species of Protagriocluvnts at present known may be called 

 P. annectens, sp. nov., and in the absence of other species with which to com- 

 pare it its definition can be formal only. This may be taken, first, from the 

 size as given in the various tables of measurements, and, secondly, from the 

 simplicity of the premolar teeth. 



The Taxononiic Position of Protagriockcerus. 

 This genus is not yet sufficiently well known to render its systematic 

 position and its phylogenetic significance clear, though what little we already 

 know concerning it is highly suggestive. The dentition, and especially the 

 upper molars, leads us almost irresistibly to the conclusion that Protagrio- 

 chcvnis is ancestral to Agriocliccnis, and this conclusion is further confirmed by 

 the character of the tarsus. This differs from that of Protoreodon in very 

 much the same way as the tarsus of Agriocliccnis differs from that of Orcodon. 



