October, 1913. New Trilobites — Slocom 65 



lateral lobes; median lobe clavate, narrow at the occipital furrow, 

 gradually widening for about half its length then abruptly widening 

 until its greatest width is reached, rounded in front; lateral lobes 

 longitudinally oval; longitudinal glabella furrows originating in deep 

 pits on the occipital furrow, converging slightly, then curving forward 

 and outward; the positions of the lateral glabella furrows are indicated 

 by three pits in the longitudinal furrows; occipital ring prominent, more 

 elevated than any other part of the cephalon, wide between the glabella 

 furrows, abruptly narrowing towards the dorsal furrows, bearing a large 

 median node with a smaller one on each side of it ; occipital furrow shal- 

 low and ill-defined in the median portion, deepened into pits near the 

 dorsal furrows. Surface of the glabella finely granular with many 

 prominent rounded nodes arranged in more or less uniform transverse 

 rows; the two largest nodes are close together near the anterior margin 

 and point forward. On the median line of the glabella just in front of a 

 line connecting the anterior pair of glabella pits is a circular, well- 

 marked pit. Cheeks large, depressed convex, not rising as high as the 

 glabella, genal angles produced into long spines, which extend backward 

 more than half the length of the thorax. Marginal borders convex; 

 posterior marginal furrows narrow and deep, lateral marginal furrows 

 not well-defined. The facial sutures originate on the lateral margin 

 just in front of the genal angles, pass almost straight to the palpebral 

 lobes, after crossing which they extend forward for a short distance, then 

 curve abruptly toward the median line and again forward to the ante- 

 rior margin. Eyes small, pedunculate and very prominent (PI. XVI, 

 fig. 4), situated on a line with the anterior pair of glabella pits near the 

 dorsal furrows; a pair of ocular ridges connects the eyes with the anterior 

 lobe of the glabella. Surface of the cheeks inside the marginal borders 

 reticulated, or covered with rows of pits; surface of the marginal borders 

 granular like the glabella, many nodes irregularly distributed over the 

 cheeks; these nodes average somewhat larger than those on the glabella; 

 the larger ones are on the posterior margin and point backward instead 

 of outward. 



Thorax composed of twelve segments, rather rapidly tapering 

 posteriorly, distinctly trilobed; axis convex, less than one-third the 

 width of the thorax; the pleural lobes curve gently for about half their 

 width and then more rapidly to the lateral margins. Each segment is 

 divided unequally by a furrow extending nearly from one margin of the 

 thorax to the other. The posterior portion, which is the wider, bears 

 numerous nodes, four of which occur on the axis and two or more on each 

 pleura. The nodes on the pleurae are much larger than those on the axis 

 and their location on different segments is not always uniform. The 



