CA M Bill A N FA UNA S F CHINA — WA L CO TT. 8 9 



strong" furrow niark.s off two sniull, .sul)-tri!iiiolar IoIk's at the postero- 

 lateral angle; a second pair of slightly marked furrows occurs upon the 

 sides, next to the dorsal furrow, a])out midway of the length of the 

 glal)clla; the sides slope inward from the base, so as to reduce the 

 width of the rounded front to about two-thirds that of the base; occip- 

 ital furrow nai'row, transverse, and deep; occipital ring narrow at the 

 sides, broadening- toward the center, where it is thick and convex; 

 dorsal furrow very distinct at the sides and front. 



Fixed cheeks convex, l)ut nuich lower than the glabella; thev are 

 al)Out as wide at the palpel)ral lobe as the width of the glalx'lla in 

 front; their appearanc(> of convexity is gi\en ))v their downward slope 

 toward the frontal rim and backward to the furrow just within the 

 posterior margin; palpebral l(>l)e small, situated about midwav of the 

 fixed cheek; no traces of ocular ridges are shown; a strong, slightlv 

 rounded, frontal rim is separated from the glabella and fixed cheeks l)y 

 a narrow, rounded, transverse furrow; postero-lateral limb short, and 

 marked by a narrow, deep furrow just ^\■ithin the raised iiosterior 

 margin. 



Surface marked by strong pustules in all parts with the exce[)tion 

 of the dorsal furrow and furrow back of the frontal rim. 



In general form this species resembles Sn/enoph'ui'd (Kjho and S. 

 (ihdcriis. It differs from the former in the shape and convexity of 

 the glabella and broader fixed cheeks and from the latter in the shape 

 of its glabella, fixed cheeks and frontal rim. 



Format Jon (ii)dJoc<d!t>j. — Middle Cambrian, Chang Hsia formation, 

 just below the Ku kSan shale; Chang Ilsia, Shangtung, CUiina. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



SOLENOPLEURA ACIDALIA, new species. 



The description of S. agno applies to this species, except that it 

 does not have the short frontal limli of the latter, and its frontal rim 

 is nearl}^ ffat instead of rounded. The surface is smooth with the 

 exception of a few large, low, scattered pustules. The head of the 

 type and only specimen in the collection has a length of 4 mm. 



ForiiKiiiori (tnd loaditij. — Middle Cambrian, central i)ortion of the 

 Chang Ilsia formation, in a com])act, dove-colored limestone; Chang 

 Hsia, Shangtung, CUiina. 



Collected b}' Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



SOLENOPLEURA AGNO, new species. 



General form of head, exclusive of free cheeks, transversely sul)- 

 rhomboidal, convex. Glabella as long as the width at its base, the 

 sides converging fiom the base toward the rounded front, so as to 



