98 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



Glabella large, subqiiadrangiilar in outline, and separated from the 

 fixed cheeks by clearly defined dorsal furrows ; its sides are nearly 

 parallel or slightly diverging ; front broadly rounded, almost trans- 

 verse ; surface marked by five pairs of furrows, the posterior of which 

 extends obliquely across the posterior portion nearly to the center 

 and separates a small triangular lobe on each side ; the next two 

 anterior pairs of furrows are short and extend inward at right angles 

 to the side of the glabella ; the next pair is nearly opposite the front 

 end of the palpebral lobe ; the anterior furrows are short and extend 

 obliquely inward subparallel to the front margin of the glabella. 

 Occipital ring narrow at the sides, widening toward the center where 

 it is marked by a small sharp node a little back of the transverse 

 center. Free cheeks large and surmounted on the inner side by a 

 narrow eye lobe. The facial sutures cut the posterior margin a little 

 within the genal angle and extend obliquely inward and slightly 

 forward to the base of the eye lobes ; curving over and around the 

 eye lobes, they extend forward and downward, cutting the front mar- 

 gin on a line with the posterior base of the eye lobe. Number of 

 thoracic segments unknown. Single specimens of the segments 

 show that the axial lobe was nearly as wide as the pleural lobes, 

 that it was moderately convex, and that a small node occurs at the 

 center of each segment near the posterior margin ; also that on the 

 outer side of each segment a rounded transverse node is outlined 

 from the main body of the segment by a slightly oblique transverse 

 furrow ; pleural lobes nearly flat out to the geniculation where they 

 curve gently downward ; each pleura has a furrow that is broad at 

 its inner end next to the axial lobe and gradually narrows to the 

 geniculation, where it terminates within the somewhat broadly 

 rounded outer extremity ; in well-preserved specimens a rounded 

 ridge starts near the inner end of the pleural furrow and extends 

 outward one-fourth of the length of the furrow. 



The associated pygidia are semicircular, with the anterior margin 

 almost transverse in the compressed specimens. The axial lobe is 

 large and quite distinctly marked ; it is divided by three transverse 

 furrows into three rings and a terminal section that ends just within 

 the outer border ; a small node occurs near the posterior margin at 

 the center of each ring ; five anchylosed segments are outlined on the 

 pleural lobes by furrows that progressively curve more and more 

 backward from the first to the posterior one which adjoins the 

 terminal segment ; the furrows all terminate within the narrow, 

 slightly flattened border. 



