80 



Family CERAURXELffi. 



CERAURUS MILLERANUS, n. Sp. 



Plate VIII, Fig. 10, a fine specimen. 



General outline of the entire body exclusive of spines subovate, 

 but abruptly narrowed at the pygidium ; surface tubercular. 

 Head exclusive of the spines subelliptical, width nearly three 

 times as great as the length. Neck furrow strongly marked. 

 Glabella gently convex dorsally, narrower at the base than the 

 width of the cheeks, but at the anterior third about as wide as 

 the posterior part of the cheeks; more convex in front and 

 abruptly bent down to the margin. There are three short lat- 

 eral furrows exclusive of the neck furrow, dorsal furrow sharp, 

 lateral lobes convex; forehead lobe short. The eyes are placed 

 about the center of the cheeks, but most distant from the dorsal 

 furrow. They are small, prominent, globose and smooth, or 

 minutely facetted. The facial sutures anterior to the eyes make 

 a sigmoidal curve to the margin, in front of the eyes, and pos- 

 teriorly they curve a little backward and cut the margin about 

 even with the neck furrow continued, cheeks bear a short thick 

 posterior spine. 



Thorax has ten segments. Axis moderately convex and nearly 

 as wide as the lateral lobes; a little wider at the anterior than 

 at the posterior segment. The lateral lobes are flattened on 

 each side of the dorsal furrow for one-third or one-half the width 

 and then the pleurae curve backward and taper to a point. A 

 line of mammillary tubercles on each lateral lobe indicates the 

 point at which the pleurae commence to curve backward. 



Pygidium very short and much narrower than the body and 

 bearing two short thick spines, that curve toward each so that 

 the points are closer than the bases. 



This species is distinguished from C. pleurexanthemvs by hav- 

 ing proportionally a shorter head, shorter and thicker cheek 



