BY R. ETHERIDGE^ JUXR., AND JOHN MITCHELL. 669 



Encrinurus ROTHWELL.E, SjJ.nOV.. 

 (Pl.lvi., figs. 1,3; Pl.lvii., fig.5.) 



Sp. Chars.—^ody long, narrowly suboval, with high steep 

 sides. Cephalon approximately semicircular, length about half 

 the width between the genal angles, densely covered with small 

 tubercles. Glabella markedl}^ pyriform and with a narrow neck, 

 front broad, rounded, tumid, and relatively very wide between 

 the anterior pair of axial tubercles; on the bulbous anterior por- 

 tion the tubercles are arranged more or less concentrically around 

 a central one, on the contracted posterior part in irregular 

 transverse rows, one row extending around the front, between the 

 anterior axial pair; all the tubercles fairly even in size; neck- 

 furrow narrow^ as is also its lateral extensions; neck-ring stout 

 and strongly arched; axial tubercles prominent and of moderate 

 size, interspaces between them wide and fairly deep; axial furrows 

 very deep. Fixed cheeks relatively large, very tumid, granules 

 between the eye-lobe and posterior furrow arranged in transverse 

 and longitudinal rows, the axial ones (five) being the larger; the 

 succeeding outward parallel row also consists of five, the other 

 rows diminishing in number of tubercles until they converge to 

 one at the junction of the posterior lateral cheek furrows; eye- 

 lobe situated far forward and inward, sulci very faint; genal 

 angles rounded. Free cheeks unknown. Facial sutures of the 

 usual character. 



Thorax steep-sided and practically subrectangular, w^idth 

 greater than the length, finely granulate; axis very prominent, 

 almost of uniform width throughout, annulations moderately 

 thickened at their bases: axial grooves deep; pleurte highly 

 geniculate, steep-sided. 



Pygidium triangular, almost equiaiigularly so; axis very pro- 

 minent between the front and the point where segmentation 

 ceases, terminates rather acutely, but nonmucronate, and with a 

 decided droop, twen by-two or more annulations, the first only 

 continuous; central tubercles small and inconspicuous, five or six 

 in number. Pleurae strongly deflected, arched, the four anterior 

 pairs strongly geniculate, the others sloping very steeply from 

 the axial furrows, front pair highly faceted. 



