NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 39 



124, presumably near the top of the Maryville limestone and identical 

 with one of the author's localities, cnc/2 to cnc/5. Collected by the 

 author at locahties cnc/5, cnc/6, cnd/1, cnd/2, cne/1, cne/2, cnb/10, 

 cnd/10, cne/10, cne/13. 



Types. — Cotypes of K. simplex: U.S.N.M. 94842. Cotypes of K. 

 harlanensis : U.S.N.M. 94863. Plesiotypes figured herein: U.S.N.M. 

 144546. 



Genus PSEUDAGNOSTUS Jaekel, 1909 



Type species. — Agnostus cyclopyge Tullberg. 



PSEUDAGNOSTUS COMMUNIS (Hall & Whitfield) 



Plate 10, figures 23-25 



Agnostus communis Hall and Whitfield, 1877, p. 228, pi. 1, figs. 28, 29. 

 Agnostus neon Hall and Whitfield, 1877, p. 229, pi. 1, figs. 26, 27. 

 Pseudagnostus communis (Hall and Whitfield) Palmer, 1955, p. 94, pi. 19, figs. 



16, 19-21 ; pi. 20, figs. 4-11, 14 ; 1960, p. 61, pi. 4, figs. 3, 4. 

 Pseudagnostus commmiis (Hall and Whitfield) Rasetti, 1961, p. 109, pi. 23, figs. 



13-17. 



A Pseudagnostus that occurs at several localities in beds of the 

 Aphelaspis zone does not differ in any observable features from topo- 

 type material illustrated by Palmer. The latter is from the Dunder- 

 hergia zone of Nevada. The author (Rasetti, 1961) figured specimens 

 from the Dunderbergia zone of Maryland, 



Occurrence. — Collected at localities cnt/1, cns/2, cns/4, cnt/4, cnt/7, 

 ens/ 15, cnt/1 5. All these collections are from the middle portion of the 

 Aphelaspis zone. 



Ty/>^j.— Plesiotypes: U.S.N.M. 144547. 



Order CORYNEXOCHIDA 

 Family DORYPYGIDAE Kobayashi, 1935 



Genus OLENOIDES Meek, 1877 



Type species. — Paradoxides nevadensis Meek. 



OLENOIDES, species undetermined 



Plate 5, figtires 12, 13 



Available material. — Two fragmentary pygidia. 



Description. — Pygidium fully typical of the genus, of the four-spined 

 group. Axis not preserved except for the terminal portion, almost 

 reaching the posterior margin. Pleural regions of low convexity. Three 

 pairs of pleural furrows and as many of interpleural grooves about 

 equally impressed, regularly curved, all becoming somewhat deeper in 

 the indefinite border furrow; each interpleural groove approximately 

 parallel to the preceding furrow but diverging from the following fur- 



