NO. 1415. CAMBRIAN FAUNAS OF CHINA— WALCOTT. 39 



granulation that gives a very highly ornamented surface under a 

 strong lens. 



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

 length of 12 mm., of which the glabella occupies 9 mm.; the width at 

 the outside of the palpebral lobes is 17 mm,, and at the ocular ridges 

 5.5 mm. 



The head of this species is much like that of Damesella hlach/Jekleri 

 in general form, but it differs in the elevated eye lobes and the pecu- 

 liarly ornamented pu.stulose surface. 



Formation and locality. — Middle Caml)rian, central portion of 

 Chang Hsia formation, in a gray slaliby limestone; 6 miles southwest 

 of Yen Chuang, Hsin Tai, kShangtung, China. 



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

 Washington Expedition to China. 



DAMESELLA BREVICAUDATA, new species. 



This species is based upon a pygidium that is transversely semicir- 

 cular in shape, with a short, strong, convex axis. The axis is marked 

 by two anterior transverse furrows and a very .shallow posterior 

 furrow, that divide the axis into an anterior ring, that joined the 

 thorax, two faintly defined rings, and a rounded terminal section; the 

 axis rounds down abruptly at its broad posterior end, passing into the 

 margin. 



The dorsal furrow is narrow and clearly detined on each side of the 

 axis. 



Pleural lobes flat for a very short distance, and then rounding down- 

 ward to the border; each lobe is marked by an anterior, deep, narrow 

 furrow within the margin, and four strong furrows terminate within 

 the border; they divide the lobes into four elevated segments that 

 merge into the irregular border; from the border fourteen spines 

 project; the anterior spines appear to be the continuation of the 

 anterior elevated margin of the p3'gidium and the first segment; the 

 second, third, fourth, and fifth spines are opposite the furrows 

 between the segments, and do not appear to be the direct continuation 

 of the segments, although a low ridge from each segment crosses the 

 margin obliquely to them; two spines project back of the axis, and 

 one on each side opposite the dorsal furrow on the side of the axis. 



Surface marked by an irregular row of rather large tubercles on 

 the rings of the axis and anch3dosed segments of the pleural lobes; 

 under a very strong lens the surface appears to be slightly roughened 

 or minutely punctate. 



Dimensions. — Length, 7 mm.; width in front of border, exclusive 

 of spines, 16 mm.; width of axis at anterior margin, 5 mm. 



Ohservations. — This species is characterized by its short, wide, 

 convex, central axis, relatively narrow pleural lobes, and very strong 

 spinose border. It differs from Borypt/ge richthofeni Dames in its 



