396 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



miles (4.8 km.) east of Center, near Blaine, Coosa Valley; and (112) 

 aroillaceous shale carrying fossiliferous cherty nodules of gox; 5 

 miles (8 km.) east-southeast of Center, both in Cherokee County, 

 Alabama. 



BLOUNTIA, new genus 



General form of dorsal shield broadly elliptical, convex. Cephalon 

 semicircular in outline with genal angles produced into short spines ; 

 border slightly rounded to convex ; frontal limb of medium width 

 and clearly defined. Glabella convex, slightly narrowing to a broadly 

 round front, smooth or with slight traces of glabellar furrows ; 

 occipital ring flat or slightly rounded and separated from glabella 

 by a narrow and often very indistinct furrow. Fixed cheeks narrow 

 to medium width ; postero-lateral limbs large, and anterior to the 

 small palpebral lobes the cheeks curve slightly outward ; a low, in- 

 conspicuous palpebral ridge crosses from the palpebral lobe to the 

 slight dorsal groove beside the glabella. Palpebral lobe and eye 

 small and situated about halfway of the length of the head, or in 

 front of its transverse center. Free cheeks with border extended 

 into a genal spine. 



Thorax with convex axis and seven flat segments that curve ab- 

 ruptly downward at the geniculation, which gives a flattened appear- 

 ance to the pleural lobes out to the geniculation ; extremities of 

 segments slightly falcate and with an enrollment facet on their 

 anterior side ; pleural furrow very shallow and best seen at the 

 geniculation ; it appears to start at the inner anterior margin of the 

 segment and to extend diagonally across the segment to the posterior 

 side of the narrowing space back of the enrollment facet. 



Pygidium semioval in outline ; axis convex, two-thirds or more of 

 the length of the pygidium ; axis and pleural lobes smooth or with 

 indications of anchylosed segments ; in the genotype the segments 

 are indicated by a slight change of color along the lines of the fur- 

 rows that usually outline the segments. The interior of the test 

 shows seven or eight segments much more strongly outlined on the 

 axis. 



Surface dense and smooth as far as known. 



Dimensions. — The only entire dorsal shield has a length of about 

 7 mm. Several cranidia indicate that some dorsal shields had a 

 length of 10 mm. None of the species appear to have attained a 

 much larger size. 



Genotype. — Blountia mimula Walcott. 



