242 THE CHICAGO ACADEMY OF SCIENCES. 



rather broad, gently arched between the lateral margins of 

 the glabella, becoming narrower back of the occipital lobes. 

 Fixed cheeks sub-triangular in outline, their surface gently 

 convex and continuous with that of the glabella; palpebral 

 lobes small, scarcely elevated. Entire dorsal surface, exclusive 

 of the furrows, thickly set with small, low, rounded papillae, 

 which are somewhat variable in size. Free cheeks, thorax 

 and pygidium not preserved. 



The dimensions of the type specimen are: length of cepha- 

 lon along median line 15.5 mm., width of cranidium between 

 the eyes 20.5 mrn., greatest width of cranidium 23 mm., width 

 of glabella at base 13.5 mm., width of glabella at middle of 

 anterior lateral lobes 16.5 mm. 



Remarks. This species like the last, has not been observed 

 in the Chicago area, and is known only from Milwaukee, Wis- 

 consin. The type specimens were collected by Mr. E. E. Teller, 

 in whose honor the species is named, and are now in his collection. 



Locality. Milwaukee, Wisconsin. 



Genus 9. METOPOLICHAS Giirich, 1901. 



Cephalon broadly sub-triangular, tuberculate. Glabella 

 completely marked off by the dorsal or axial furrows ; the second 

 lateral glabellar furrows obsolete or indicated only by slight 

 indentations of the first lateral furrows at the sides of the median 

 glabellar lobe, and the third pair of lateral furrows also exhibiting 

 a tendency to become obsolete, so that the third pair of lateral 

 lobes are not sharply defined; basal or occipital lobes present. 

 Cheeks broad, produced laterally into long, curved, genal spines 

 which extend outward and backward, the post-cephalic margin 

 curving forward to the bases of the spines. Pygidium with a 

 rather short, elevated axis with one or two annulations, and a 

 broad flattened post-axial area; lateral lobes flattened, with 

 three pairs of grooved pleural segments, the two anterior pairs 

 completely defined and with free points, the third pte-ir not 

 completely marked off from the post-axial area posteriorly and 

 without free points. 



Metopolichas pugnax (W. & M.), pi. xxi, figs. 1-4. 



Description. Cephalon broadly sub-triangular in outline, 

 the margin rounded in front, becoming sinuate on either side 

 in front of the eyes in th anterior portion of the free cheeks, 

 and then broadly convex to the extremities of the genal spines, 

 the post-cephalic margin curving forward near the postero- 



