50 The Fauxa of the Keyser Member of the 



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

 axial portion of the occipital segment, covered with fine, irregular papillse ; 

 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 Xew 

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

 have come from the Keyser member. 



Occurrence. — Helderberg Formation, Keyser Member. Cumber- 

 land. 



Collection. — George M. Eoeder. 



Order PROPARIA 

 Family CALYMENIDAE 



Genus CALYMENE Biongniart 



Calymene camerata Conrad 



Plate LXXXIX, Fig. 9 



Calymene camerata Conrad, 1842, Jour. Acad. Nat. Sci., Phila., vol. viii, p. 



278. 

 Calymene camerata Hall, 1852, Pal. N. Y., vol. ii, p. 337, pi. Ixxviii, figs. la-/. 



Description. — " Cephalic shield wide, subcrescent form ; anterior 

 margin elevated in a strong fold, a deep groove separating it from the 

 front of the glabella and cheeks ; glabella broader and nearly straight in 

 front, furnished on each side with three distinct tubercles, the posterior 

 one very large and prominent, the anterior one minute; eyes opposite 

 to the central lobe of the glabella ; the furrow between the glabella and 

 cheeks very deep ; a projecting lobe from behind the eye touches or unites 



