40 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 93 



Genotype. — Olenopsis americanus Walcott. 



Range. — Thus far confined to the Albertella zone of the Middle 

 Cambrian, 



DESCRIBED SPECIES REFERRED TO KOCHINA 



Kochina americana (Walcott) 



Olenopsis americanus Walcott, Smithsonian Misc. Coll., vol. 57, no. 8, p. 243, 

 pi. 36, figs. 8-11, 1912. 



Middle Cambrian, Gordon; (loc. 4v) Gordon Creek, Montana. 

 Cotypcs.—U.S.'N.M. nos. 58368-71. 



Kochina bosworthensis, n. sp. 



Olenopsis cf. americanus Walcott, Smithsonian Misc. Coll., vol. 67, no. 2, p. 2,7, 

 pi. 6, fig. 8-8&, 1917. 



Middle Cambrian, Ptarmigan; Mount Bosworth (loc. 35c) and 

 Popes Peak, above Ross Lake (loc. 63J), British Columbia. 

 Lectotypc. — U.S.N.M. no. 63749; paratype, nos. 63450-1. 



MACELLOURA, n. gen. 



Diagnosis. — Cranidium quadrate, facial sutt:res diverge anterior to 

 eye, making sharp, salient, down-turned anterior angles ; postero- 

 lateral limbs short. Glabella quadrate, tapering but slightly ; extends 

 to anterior margin ; without glabellar furrows ; wide. Fixed cheeks 

 one-fourth width of glabella ; eyes rather small. 



Pygidium spade-shaped with anterior pleural furrows making up- 

 turned sides ; dorsal furrow marked only by change in slope ; axial 

 and pleural lacking ; axis tapering rapidly, half as long as pygidium. 



Free cheeks and thorax not known. 



Genotype. — Illaeniirus ? dia Walcott. 



Name. — MaKcAAa = spade ; ovpa = tail. 



Range. — About middle Upper Cambrian, or somewhat younger. 



Macelloura dia (Walcott) 



lUaenurus ? dia Walcott, Proc. U. S. Nat. Mus., vol. 13, p. 277, pi. 20, fig. 6, 



1890. 

 N ileus ? dia Walcott, Smithsonian Misc. Coll., vol. 57, no. 13, p. 359 (gen. 



ref.), 1914. 



Upper Cambrian, Wilberns ; (loc. 70a) Morgans Creek, Burnet 

 County, Texas. 



Cotypes. — U.S.N.M. no. 23865. 



METEORASPIS, n. gen. 



Diagnosis. — Cranidium but little larger than glabella. Glabella 

 large ; dorsal furrow well defined ; without glabellar furrows. Occipital 



