NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 71 



of the pygidium, which completely lacks the lateral expansion of the 

 posterior border clearly apparent in the specimens of L. modesta fig- 

 ured by Lochman (1938) and Palmer (1954). 



The type specimens of walcotti are preserved in limestone, while 

 those of rogersvillensis are flattened in shale, but there seems to be no 

 specific difference between the two. 



Occurrence. — Type locality for L. rogersvillensis is U.S.N.M. 24m, 

 near Rogersville. Type locality for L. walcotti is U.S.N.M. 107, NW. 

 of Knoxville. The figured specimens are from the uppermost beds of 

 the lower limestone member of the Nolichucky (Crepicephalus zone) 

 at locality cnn/3. 



Types. — Holotype and paratypes of L. rogersvillensis: U.S.N.M. 

 94974-5. Holotype and paratypes of L. walcotti: U.S.N.M. 94970-1. 

 Plesiotypes : U.S.N.M. 144625. 



Genus GENEVIEVELLA Lochman, 1936 



Type species. — Genevievella neunia Lochman. 



GENEVIEVELLA, species undetermined 



Plate 5, figures 9-11 



Known from several cranidia. The shape and convexity of glabella, 

 frontal area and posterior area are about the same as in the type spe- 

 cies. However, the present form lacks the strong elevation of the 

 palpebral area and palpebral lobes present in G. neunia. As the material 

 is scarce, imperfectly preserved, and from different localities, it does 

 not warrant naming a new species. 



Occurrence. — A large cranidium was collected from locality cnc/4, 

 and another from locality cnc/2, both in the uppermost Maryville 

 limestone. Further material was collected in limestone beds or lenses 

 at the base of the Nolichucky (localities cnd/1, cne/2). All these beds 

 belong in the Cedaria zone. 



Disposition of material. — Figured specimens : U.S.N.M. 144626-7. 



Family ELVINIIDAE Kobayashi, 1935 



Genus DUNDERBERGIA Walcott, 1924 



Type species. — Crepicephalus (Loganellus)nitidus Hall and Whit- 

 field. 



DUNDERBERGIA TENNESSEENSIS Rasetti, new species 



Plate IS, figures 1-12 



Available material. — Several cranidia and free cheeks, two pygidia, 

 and one tentatively assigned hypostome. 



Description. — Glabella of fairly strong convexity, straight-sided, 

 tapered, somewhat truncate in front, defined by deep axial furrows 

 laterally, shallower furrow in front. Three pairs of lateral furrows; 



