cur stac/:, i. L05 



Facial Sutures normal, rapidly approximating on the broad frontal border 



Glabella broadly conate or sub-triangular, slightly constricted at the ante- 

 rior angles of the eyes and rounded to the frontal extremity, which is closely 

 appressed upon the marginal sulcus. Width at the base equal to one-third 

 that of the shield. Length greater than the width. Surface convex, de- 

 pressed above, and sloping in all directions to the cheeks. Lateral furrows 

 obscure, obsolete upon the test, hut under favorable preservation sometimes 

 visihle upon the cast of the lower surface. A single example shows three 

 pairs and the accessory furrows or pits, the anterior of these pairs being 

 numerically the second, the first pair being obsolete. They are all inclined 

 posteriorly, and the last or fourth pair reach almost to the occipital furrow. 

 Occipital lobes conspicuous ; occipital furrow narrow, scarcely widening on 

 the cheeks; occipital ring moderately broad and Hat, narrowing slightly upon 

 the cheeks. 



Cheeks depressed on the summit about the orbital lobe, and sloping with a 

 somewhat abrupt curve to the strong marginal sulcus. 



Eyes relatively large, and closely appressed to the glabella. Palpebral 

 lobe very small ; palpebral furrow shallow and elevated. 



Thorax sub-rectangular, lateral margins slowly approximating posteriorly. 

 Length to width as 2 to 1. 



Axis broad and strongly arched, width upon the anterior margin more than 

 one-third the width of the thorax. Sides evenly approximating to the 

 pvgidium. The segments are flattened, transverse, or with a slight forward 

 curve toward the axial line. 



Pleura flattened near the axis, and at about one-third their width deflected 

 in a more or less abrupt curve to the margins. Pleural annulations groo\< d, 

 the anterior limb of each becoming rapidly obsolete beyond the fulcrum. 



Pygidiu.m. Posterior outline the arc of a circle whose center is the middle 

 point of the body ; when slightly compressed it is distinctly emarginate at 

 the posterior extremity: border broad, moderately thickened. Length about 

 one-half the width. 



