28 PROCEEDING'S OF THE NATIONAL MUSEUM. vol. xxix. 



FoniKition (imJ loral/fi/. — Middle Cambrian, in shales corresponding 

 to the Kii San shale formation; isolated hills 12 miles S. 80° E. of Tai 

 An Fu, Shangtuno-, China., 



Collected by Eliot Blackwelder, of the Carneoie Institution of 

 Washing-ton Expedition to China. 



Genus DORYPYGE Dames. 

 DORYPYGE BISPINOSA, new species. 



This species is based on a pygidiiim having a strong, broad axis, 

 narrow pleural lobes, and two long, strong spines that project 

 obliciuely backward from the postero-lateral angle of the pygidium. 



The central axis has a length of 10 mm.,- with a width at the ante- 

 rior end of 6 mm. and at the posterior terminal lobe of 6 mm., 

 narrowing slightly at the second and third rings; it is divided by 

 three shallow, rounded, transverse furrows into three slightly convex 

 rings and a terminal ring nearly as long as the two posterior rings; 

 there is also a narrow anterior ring that connected the p3^gidium with 

 the thorax; the terminal ring is convex and slightly overhangs the 

 margin; a node or slight swelling is indicated on each side of the 

 median line where the ring slopes abruptly down to the margin. 



Dorsal furrow rounded and somewhat irregular. 



Pleural lo])es slightly narrower than the axis and arching from the 

 dorsal furrow directly down to the border; the lobes are divided b}^ 

 three broad furrows into an anterior, marginal, elevated rim and two 

 slightly concave segments; a third and posterior segment is indis- 

 tinctl}' outlined; the furrows and segments terminate within a slightly 

 thickened border. Three pairs of short spines occur on the border 

 opposite the two anterior segments and frontal rim of the pleural 

 lobe; opposite the faintl}" defined posterior segment there is a long, 

 strong spine, and from the space between the latter spine and where 

 the dorsal furrow intersects the border there is another longer and 

 stronger spine that extends obliquely outward and backward. 



The surface is marked by a few pustules that occur on the elevated 

 portions of the rings of the axis and the pleural lobes; under a 

 strong lens the crust appears to be slightly roughened and appaicntly 

 minutely punctate. 



Dimensions. — Length, 11 mm.; width at the anterior border, 16 

 mm.; width of axis, 6 mm.; width of pleural lobe at anterior portion, 

 5 mm. 



Ohservations. — In general outline this p\"gidium is somewhat like 

 that of Dorypyge richthofenl Dames. It ditiers in the proportionately 

 broader axis, narrower pleural lobes, and the pair of strong spines at 

 the postero-lateral angle. 



