3/6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



SAUKIA COLORADOENSIS, new species 



Text figures 13-16 



Dicellocephaliis minnesotensis ? , 1886, Monogr. U. S. Geol. Survey, Vol. 12, 

 p. 60. (Name mentioned in text. Label with specimens states that the 

 identification was by R. P. Whitfield.) 



This species is represented by fragmentary specimens of the 

 cranidium, free cheeks, thoracic segments, and pygidium. At first 

 I referred it to Saukia crassunarginata, but on working the cra- 

 nidium and pygidium free from the covering matrix it was found to 

 differ. The frontal hmb is less convex and is marked by a slight 



Saukia coloradoensis, new species 



Fig. 13. (X 2.) Cranidium flattened in shale. Postero-lateral limbs re- 

 stored. U. S. National Museum, Catalogue No. 60673. 



Fig. 14. (Natural size.) Large free cheek with outline partly restored. 

 U. S. National Museum, Catalogue No. 60674. 



Fig. 15. (Natural size.) Pygidium with outline restored. U. S. National 

 Museum, Catalogue No. 60675. 



Fig. 16. (Natural size.) Matrix of pygidium with outline partly restored. 

 U. S. National Museum Catalogue No. 60676. 



