THIRD CONTRIBUTION TO 

 NOMENCLATURE OE CAMBRIAN TRILOBITES 



By CHARLES ELMER RESSER 



Curator, Division of Invertebrate Paleontology 

 U. S. National Museum 



This is the third paper in a series deahng with nomenclatural 

 changes necessary for Cambrian species/ As in the previous papers, 

 only trilobites are included, the nontrilobitic species being reserved for 

 separate printing. Also, the former plan of arrangement in alpha- 

 betical order according to genera is continued. As a rule, foreign 

 species from regions where specialists are known to be at work have 

 not been considered. 



ALBERTELLA Walcott, 1908 



Albertella cimon (Walcott) 

 Zacanthoides ? cimon Walcott (part), Smithsonian Misc. Coll., vol. 67, no. 2, 

 p. 41, pi. 7, fig. 6, 1917 (fig. 6a an indeterminate fragment of Kootenia). 



Middle Cambrian, Ptarmigan ; (loc. 63b) Ptarmigan Peak, near 

 Lake Louise, Alberta. 



Holotypc. — U.S.N.M. no. 63767. 



ANTAGMUS Resser, 1936 



Antagmus pia (Walcott) 



Ptychoparia pia Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 93, pi. 12, 

 fig. 8, 1917. 



Lower Cambrian, Mount Whyte ; (loc. 35f) Mount Stephen, near 

 Field, and (loc. 35h) Mount Bosworth, British Columbia. 

 J/o/o^y/)^.— U.S.N.M. no. 64391. 



Antagmus cuneas (Walcott) 



Ptychoparia cuneas Walcott, Smithsonian Misc. Coll., vol. 67, no. 3, p. 87, 

 pi. II, fig. 4, 1917. 



Occurrence same as preceding. 

 Holotype.—U.S.'NM. no. 64369. 



^Resser, Charles Elmer, Nomenclature of some Cambrian trilobites, Smith- 

 sonian Misc. Coll., vol. 93, no. S> Feb. 14, I935 ; Second contribution to nomen- 

 clature of Cambrian trilobites, idem, vol. 95, no. 4, April i, 1936. 



Smithsonian Miscellaneous Collections, Vol. 95, No. 22 



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