490 Systematic Paleontology 



margin of the head to the front of the eye-lobe, and after passing around 

 the eye, bending outward and cutting the posterior margin near the base 

 of the genal spines. Occipital segment broadened in the middle with a 

 small median tubercle. Thorax unknown. Pygidium semielliptical in 

 outline, broader than long, with a broad, flattened, marginal border; the 

 axis much elevated, occupying about one-third the entire width in front, 

 tapering gradually to the obtusely rounded extremity which lies just 

 within the flattened border, divided into thirteen or fourteen segments; 

 the pleural strongly convex to the flattened border, divided into eight or 

 nine sharply grooved segments, which become obsolete at the marginal 

 border. 



" The entire surface of the glabella except the lateral furrows, also the 

 axial portion of the occipital segment, covered with flne, irregular papillge ; 

 the anterior portion of the cheeks is covered with elongate, raised, vermi- 

 form markings, which become shorter and papillose posteriorly. The 

 marginal border and genal spines are smooth, except on the edge, where 

 they are covered with fine, elongate, raised lines. The axial and pleural 

 segments of the pygidium are papillose, the flattened border being smooth 

 within, but toward the margin covered with fine, raised tubercles and 

 elongate flexuose markings." Weller, 1903. 



This species was discovered and named by Dr. S. T. Barrett; who gave 

 a brief description of it. By him it was found in the " Coralline lime- 

 stone " and is cited by Weller from the Decker Ferry formation of New 

 Jersey. It is not unlikely that the single specimen from Maryland may 

 have come from the Keyser member. 



Occurrence. — Heldeeberg Formation, Keyser Member. Cumber- 

 land. 



Collection. — George M. Boeder. 



[Maynard.] 



PrOETUS CF. rROTUBERANS Hall 



Plate LXXXIX, Figs. 2-4 



Proetus protuberans Hall, 1859, Nat. Hist. N. Y., Pal., vol. iii, p. 351, pi. Ixxiii, 

 figs. 5-8, 1861. 



Description. — " Entire form oblong elliptical. Head semicircular, very 



gibbous; the glabella very prominent, rounded in front, not distinctly 



