NO. 3 UPPER CAMBRIAN TRILOBITE FAUNAS — RASETTI 55 



near Winchester, Va. Plesiotypes from localities cnm/2 and cnn/1, 

 in the upper portion of the lower limestone member of the Nolichucky 

 (Crepiceplialus zone) . 

 ry/>^j.— Plesiotypes: U.S.N.M. 144592-3. 



METEORASPIS BREVISPINOSA Rasetti, new species 



Plate 6, figures 9-12 



Available material. — Several cranidia and pygidia preserved in lime- 

 stone, the larger ones lacking the test. 



Description. — Glabella of usual shape and convexity, unfurrowed, 

 defined by a deep axial furrow all around. Occipital furrow deep, occip- 

 ital ring rounded, bearing a low node. Preglabellar field and palpebral 

 area narrow, convex, downsloping; border elevated, convex, defined 

 by a deep border furrow ; the latter with a pair of shallow depressions. 

 Posterior area deeply furrowed. 



Pygidium subrectangular, about as wide as long. Axis very promi- 

 nent, large, somewhat tapered, rounded posteriorly, almost reaching 

 posterior margin ; 3 rings and a terminal section defined by deep fur- 

 rows. Pleural lobes steeply downsloping, with fairly straight sides 

 slightly convergent backward, extended into a pair of blunt spines; 

 margin between spines straight for a considerable length. A few broad 

 and shallow pleural furrows indicated on internal impression ; border 

 furrow and border indistinct. On the outer surface the pleural lobes 

 would probably appear almost entirely smooth, except for the an- 

 terior marginal furrow. Length of largest cranidium 11 mm., of 

 largest pygidium 1 1 mm. 



Discussion. — The cranidium differs little from M. metra and other 

 described species, but the pygidium is characteristic, lacking the long 

 spines of other species. The pygidium of M. mutica lacks spines but is 

 quite different in other respects. 



Occurrence. — Lower portion of lower limestone member of the 

 Nolichucky (Cre pic ephalus zone) at locality cnk/1. 



Types. — Holotype (pygidium): U.S.N.M. 144594. Paratypes: 

 U.S.N.M. 144595. 



Family ASAPHISCIDAE Raymond, 1924 



Genus BLOUNTIA Walcott, 1916 



Type species. — Blountia mimula Walcott. 



BLOUNTIA ARCUOSA Resser 



Plate 9, figures 1-8 

 Blountia arcuosa Resser, 1938a, p. 64, pi. 12, fig. 25. 



Available material. — The hypodigm contains only cranidia. Excel- 

 lent additional material allows a more complete description of the 

 species. 



