38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Cranidiuni may belong to another species. 



Middle Cambrian, Ptarmigan ; (loc. 63d) east base Ptarmigan Peak, 

 5| miles northeast of Lake Louise, Alberta. 

 Cotypes. — U.S.N.M. nos. 63744-6. 



Kochaspis ? gogensis (Walcott) 



Ptychoparia gogensis Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 88, 

 pi. 12, figs. 4, 4a, 1917. 



Lower Cambrian, Mount Whyte ; (loc. 62w) above Gog Lake, 

 Wonder Pass, British Columbia. 

 Holotypc.—U.S.^M. no. 64386. 



Kochaspis carina (Walcott) 



Ptychoparia carina Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 80, 

 pi. 13, fig. 6, 6a, 1917. 



Middle Cambrian, Ptarmigan ; (loc. 35m) 3 miles southwest of head 

 of Lake Louise, Alberta. 



Holotype. — U.S.N.M. no. 64400. 



Kochaspis upis (Walcott) 



Crepicephalus upis Walcott, Smithsonian Alisc. Coll., vol. 64, no. 3, p. 218, 

 pi. 33, figs. 4-4d, 1916. 



Middle Cambrian, Gordon Mountain; (loc. 150b) Chinese Wall, 

 South Fork, White River-Indian Creek Pass, Montana. 



Lcctotypc— U.S.N.M. no. 61697 ; paratypes, nos. 61695, 61696, 

 61698. 



Kochaspis unzia (Walcott) 



Crepicephalus luizia Walcott (part), Smithsonian Misc. Coll., vol. 64, no. 3, 

 p. 217, pi. 34, fig. -a, 1916. (Not 7 := undescribed genus.) 



Occurrence same as preceding. 

 i7o/o/_v/'t\— U.S.N.M. no. 61706. 



KOCHIELLA Poulsen, 1927 



Kochiclla Poulsen, Meddels. Grj^Snland, vol. 70, p. 259, 1927. 



We are here dealing with a group of trilobites which developed 

 greatly in late Lower Cambrian time, continuing into the Middle 

 Cambrian. Aside from the two genera made by Poulsen, this group 

 has long needed complete revision. Even now the final word cannot 

 be said. 



Diagnosis. — Trilobites with wide cranidia. Glabella clearly define<l, 

 with three pairs of furrows usually developed. Brim wide flat or 

 concave, with a narrow rim faintly outlined ; conspicuous feature of 

 brim is impression of doublure on upper surface, which simulates a 



