94 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



and an occipital ring- ov^er 3 mm. in width. The surface of the frag- 

 ment of the ola})ena is marked by strong pustules, which give it a 

 somewhat granulose appearance. The cast of the fragment of the 

 .interior of the free cheek indicates that it was pustulose and that the 

 postero-lateral angle terminated in a long, curved spine. 



The two fragments descril)ed are so distinctly marked by the coarse 

 granulation and the free cheek by its curved terminal spine that 

 there is little danger of confusing it with an}' other species. 



For illation and locality. — Middle Cambrian, Chang Hsia formation, 

 in a dark oolitic limestone toward the lower portion of the formation; 

 a mile east of Chang Hsia and Chao Mi Tien, Shangtung, China. 



Collected by Eliot Blackwolder, of the Carnegie Institution of 

 Washington Expedition to China. 



Genus DOLICHOMETOPUSAngelin. 



DOLICHOMETOPUS ALCESTE, new species. 



This species occurs at the same locality as D. deois, but not in the 

 same bed of limestone. It differs from I), deois in having a much 

 more convex glabella, with nearly parallel sides. Glabella marked by 

 a postei'ior pair of furrows, extending inward and backward so as to 

 nearly cut oif a small subtriangular lobe at the base of the glabella, 

 also three pairs of short, faintly impressed furrows that extend in at 

 right angles to the side of the glabella; occipital furrow and ring 

 unknow^n; dorsal furrow shallow, but well detined. 



Fixed cheeks very narrow; they slope down into the strong furroAv 

 just within the narrow palpebral lobe and anteriorly slope down to 

 the frontal limb; the rim of the palpebral lobe crosses the narrow free 

 cheek, forming a ver}^ short ocular ridge; frontal limb short, nearly 

 ilat. The glabella of the only specimen of this species has a length of 

 12 mm., with a width at the ocular ridges of 8 mm.; the frontal limb 

 has a length of 1.5 mm. The exterior surface under a strong lens 

 shows a few fine scattered punctae. The inner surface of the frontal 

 limb where exposed by a breaking awa}^ of a portion of the shell is 

 strongl}^ punctate. 



Format ion and locality. — Middle Cambrian; near the base of the 

 Chang Hsia formation, in a gray limestone in which great numbers of 

 Agnosias ckinensis., Dames, occur; 3 miles southwest of Yen Chuang, 

 Hsin Tai, Shangtung, China. 



Collected by Eliot Black welder, of the Carnegie Institution of 

 Washington Expedition to China. 



DOLICHOMETOPUS DEOIS, new species. 



This species is represented by the central portions of the head, 

 (llabella and fixed cheeks moderately convex; glabella prominent, 

 moderately convex, and marked by three pairs of rather short, very 



