64 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



Occurrence. — Uppermost beds of the Maryville limestone {Cedaria 

 zone) at localities cnc/4, cnc/6. 



Disposition of material. — Figured specimens: U.S.N.M. 144699- 

 700. 



Family NORWOODIIDAE Walcott, 1916 



Genus NORWOODIA Walcott, 1916 



Type species. — N orwoodia gracilis Walcott. 



NORWOODIA ROGERSVILLENSIS Resser 



Plate 4, figures 25, 26 



Norzvoodia rogersvillensis Resser, 1938a, p. 91, pi. 9, figs. 25, 26. 

 Norwoodia harlanensis Resser, 1938a, p. 91, pi. 9, fig. 31. 



Available material. — The hypodigms consist of cranidia from the 

 same locality. In addition to further cranidia, pygidia occur in the 

 author's collection. 



Description. — Glabella tapered, rounded in front, rather convex, 

 defined by a well-impressed axial furrow. Glabellar furrows probably 

 obsolete on outer surface. Occipital furrow shallow ; occipital ring ex- 

 tended into a large, horizontal spine longer than the glabella. Frontal 

 area as long as glabella, mostly consisting of downsloping preglabellar 

 field; border wide (sag.), upturned. Palpebral area about half the 

 glabellar width; ocular ridges distinct. Anterior sections of facial 

 sutures very slightly divergent; posterior section directed outward 

 and somewhat forward, reaching the margin well in advance of genal 

 angle. Posterior area slightly expanding distally, well furrowed, ex- 

 tended into a slender and moderately long genal spine. 



The pygidia are attributed to the species because of the close simi- 

 larity to N. gracilis and other closely related species. Pygidium twice 

 as wide as long, convex. Axis defined laterally, merging with the 

 pleural region posteriorly, of 3 distinct rings. Pleural lobes convex, 

 with 3 pairs of shallow furrows ; border narrow but distinct. All the 

 described cranidial and pygidial features refer to the impression of the 

 interior since none of the specimens preserves the test. 



Discussion. — Among the species of the southern Appalachians, the 

 present one resembles N. gracilis Walcott, differing mainly in the 

 proportionately wider and shorter glabella, shorter occipital spine, and 

 different shape of the posterior area and genal spine. 



Occurrence. — Found only in the red beds {Cedaria zone) at the 

 base of the Nolichucky. Type locality is U.S.N.M. 27d, the same as 

 the author's locality cnd/1. 



Types. — Holotype : U.S.N.M. 94847. Holotype of A'', harlanensis: 

 U.S.N.M. 94850. Plesiotypes : U.S.N.M. 144610. 



