56 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 148 



Description. — Glabella very slightly expanding forward in the pos- 

 terior half, well rounded anteriorly, exceedingly convex in the anterior 

 portion, overhanging the frontal area; occipital furrow exceedingly 

 faint on outer surface, occipital ring very short (sag.) ; glabellar fur- 

 rows lacking. Preglabellar field vertical; border about as wide (sag.) 

 as the preglabellar field, convex, with terrace lines. Anterior sections of 

 facial sutures parallel ; posterior section with gentle curvature, defining 

 slender, sharply pointed, faintly furrowed posterior area. Palpebral 

 lobes small and faintly elevated; palpebral area about 0.2 times the 

 glabellar width. 



Pygidium almost twice as wide as long. Axis long, not rising above 

 the general convexity; axial furrow shallow. Pleural lobes with con- 

 vexity increasing toward the margin, lacking distinct border furrow 

 and border, sharply downrolled especially in the posterior portion. 

 Furrows obsolete on outer surface ; on interior cast, 6 or 7 rings are 

 distinguishable on the axis and 3 faint pairs of furrows on the pleural 

 lobes. Surface smooth. 



Occurrence. — Type locality is U.S.N.M. 121a, 4 miles NE. of 

 Rogersville. The species is not rare in the upper part of the lower 

 limestone member of the Nolichucky formation (Crepicephalus zone) 

 in the Rogersville area (localities cnm/1, cnm/2, cnn/2, cnn/3) . 



73;/^^.?.— Holotype : U.S.N.M. 94960. Plesiotypes: U.S.N.M. 

 144555. 



BLOUNTIA ALEXAS Walcott 



Plate 9, figures 9-12 



Blountia alexas Walcott, 1916b, p. 398, pi. 61, figs. 5, Sa. 

 Blountia alexas Walcott, Resser, 1938a, p. 65, pi. 12, fig. 27. 



Available material. — The hypodigm consists of the holotype crani- 

 dium. Additional cranidia and pygidia allow a more complete descrip- 

 tion. 



Description. — Glabella of moderate convexity, straight-sided, 

 slightly tapered, rounded in front, unfurrowed. Occipital furrow al- 

 most indistinct on outer surface, occipital ring very short (sag.). 

 Preglabellar field on the average somewhat shorter (sag.) than border, 

 the ratio varying somewhat in different individuals; border sHghtly 

 convex, wide (sag.), set off from preglabellar field by its upturned 

 position. Palpebral area about 0.3 times the width of glabella at same 

 level. Anterior facial sutures divergent, anterior angles of cranidium 

 well rounded ; posterior section of facial suture with gentle curvature ; 

 posterior area falcate, extending farther backward than occipital ring, 

 with faint furrow in proximal portion only. 



Pygidium with little convexity. Length 0.6 times width. Axis ta- 

 pered, occupying two-thirds of length ; axial furrow shallow laterally, 



