90 PROCEEDINGS OF THE NATIONAL MUSEUM. 



narrow the glal^ella about one-fourth; a very slight trace of a short, 

 posterior pair of farrows can be seen by reflected light; occipital 

 furrow well defined b}^ the downw^ard curvature of the posterior mar- 

 gin of the glabella, and rising of the surface of the occipital ring; the 

 latter is narrow at the sides, gradually widening toward the center, 

 which is most elevated a little in front of the posterior margin; dorsal 

 furrow narrow, but clearlj^ defined at the sides in front of the glabella. 



Fixed cheeks about one-half the width of the glabella at the center, 

 rather convex, and sloping somewhat abruptly to the frontal rim; 

 palpeV)ral lobe small, situated al)out midway of the cheeks; postero- 

 lateral limbs unknown; frontal limb very narrow in front of the gla- 

 l)ella, convex, and curving down to the broad groove within the strong, 

 rounded, frontal rim. 



Surface luarked by low pustules that give it a roughened appear- 

 ance. The type and only specimen of the head in the collection has a 

 length of 6 mm. 



This species is characterized b}' its broad, short glabella, narrow 

 frontal limb, and peculiar granulose surface. 



For mat ion and local Uy. — Middle Cambrian, upper portion of the 

 Chang Hsia formation, just l)eneath the Ku San shale, in a rather 

 coarse, light-gray limestone. Chang Hsia, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 W ashington Expedition to China. 



SOLENOPLEURA BELUS, new species. 



This species is represented l^y a fragment of the head that includes 

 the glabella and fixed cheeks. The glabella is moderately convex and 

 narrows slightl}^ toward the rather l)roadly rounded front; the surface 

 is marked by a pair of short, ol)liqiie, posterior furrows and one ante- 

 rior pair at about the anterior third; occipital furrow narrow, distinct, 

 arching forward at the center and considerably deeper toward the end; 

 occipital ring clearl}' defined, of moderate width, and slightly convex; 

 dorsal furrow narrow and clearly defined. 



Fixed cheeks narrow, scarcely more than a ridge between the dorsal 

 furrow and the palpebral lobe; posteriorly the}^ slope downward to a 

 long postero-lateral limb and anteriorly drop rather rapidly to the 

 frontal liml); palpel>ral lobe a little more than one-third the length of 

 the glabella; postero-lateral limb about as long as the width of the 

 glabella in front, deeply grooved along its center l)y a furrow parallel 

 to the elevated posterior margin; frontal limb short and slightly con- 

 vex in front of the glabella; it passes into a shallow furrow within a 

 slightly rounded frontal rim; the latter is broken away except at the 

 ends. 



Surface marked l)y numerous scattered, rather small pustules. 

 Length of head mm., with a width at the palpebral lobes of 5 mm. 



