658 SILURIAN TRILOBITES OF NEW SOUTH WALES, V., 



the anterior and posterior extremities, whence it slopes gently to 

 the anterior border, widest between the anterior i3air of lateral 

 tubercles (pseudo-lobes); front border, when the free cheeks are 

 absent, having a subbattleaxe contour; general surface copiously 

 granulated, granules variable in size, imperforate, posteriorly 

 arranged in two oi- three transverse pai'allel rows, anteriorly one 

 or more rows concentric with the front cephalic border, but on 

 the general surface a quincuncial arrangement is assumed, or 

 in oblique ii'regular i-ows; five pairs of tubercles bordering the 

 axial furrows only of moderate size, the anterior and posterior 

 pairs much smaller than the intermediate pairs; neck-furrow in- 

 conspicuous, but its lateral extensions across the fixed cheeks 

 rather wide and shallow; neck-ring similar to the adjoining 

 thoracic ring but rather more arched; axial furrows pronounced 

 (inconspicuous in testiferous specimens); fixed cheeks tumid, 

 similarly granulated to the glabella centre, tubercles along the 

 inner border abutting the axial grooves only moderately pro- 

 minent; palpebral, or ocular lobes, prominent and bounded by 

 well marked sulci, posterior border narrow but distinct; genal 

 angles rounded and thickened. Free cheeks tumid, granulate, 

 the anterior portions lobe-like, the latero-posterior portions rising 

 abruptly to support the pedunculate, faceted, convex eyes; ped- 

 uncles bounded by sulci, border thickened, bearing one row of 

 conspicuous, and other irregularly placed tvibercles, furrow within 

 the border distinct and posteriorly communicates with the trans- 

 verse furrow of the fixed cheeks, and anteriorly with the axial 

 grooves and stops there, the transverse distance between the eyes 

 is about equal to the length of the glabella. Facial sutures bi- 

 sigmoidal or rolling V-shaped, the sigma anterior to the eyes, the 

 shorter and more acute, the posterior terminating in front of the 

 genal angles. Hypostome rhomboidal; tumid, centrally non- 

 lobate, but anteriorly cucullate. Thorax: length about equal to 

 that of the combined width of the axis and one pleura, finely gran- 

 ulate. Axis slightly subfusiform, width about five-sixths of that 

 of a side-lobe, the annulations tuberculate at their extremities, 

 and moderately ai'ched tiunsvei'sely and anteriorly. Pleural seg- 



