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5. W. WILLISTON 



metapodials and the first row of the phalanges attached, except 

 that the epipodial supernumeraries are absent. Another, similarly 

 united proximal series of the smaller bones has the first epipodial 

 supernumerary in place, and there is possibly a place for a second one, 



9 10 



Fig. 9. — ■ Trinacromerum anonymum Williston. Outline of anterior part of skull, 



from above; a little less than one-sixth natural size. 



Fig. 10. — T. anonymum. Outline of mandibles from below; a little less than 



one-sixth natural size. 



