(iv) 38 Palteontologia Sinica Ser. B. 



marked broad and arched transverse rounded furrows into four transverse rings and a 

 long terminal portion v/hich has a slight fifth depression, indicating a fifth ring; the pos- 

 terior portion of the axis slopes gradually down to the margin. 



Owing to strong weathering and abrasion of this specimen, the presence or 

 absence of two long, strono-, liackward-extending spines can not be determined. 



Dorsal furrow shallow and distinct. Pleural lobes flat for a short distance from 

 the axis, and then curve gently downward to the border; they are separated by four 

 shallow furrows which divided the limb into five corresponding segments. The spines of 

 the border are practically continuations of the pleural lobes. 



The most interesting fact is that this pygidium occurs in a bed of conglomeratic 

 limestone from the uppermost part of the Kushan formation. Certainly it represents the 

 latest type of the Middle Cambrian. 



Measurements: — No. 527 



Length of pygidium 25 mm. 



Anterior width or greatest width 40 mm. 



Horizon and Locality: — ?\Iiddle Cambrian: from conglomeratic limestone of 

 Kushan formation of Kushan; @ [Ij collected by C. C. Tien and Y. T. Chao who were 

 in my party during the University Excursion. 



Genus DamESELLA Walcott 

 Damesella blackwelderi Walcott var. minor Sun (var. nov.) 



Mate ir, Figs. 9 a-c. 



cfr. 190,5 Damesella blackivelderi Walcdtt Proc' U. S. Nat. Mus-, Vol. XXIX, p. a."}. 



cfr. 1913 Damesella blackwelderi Walcott, Research in China, Vol. IV, ^'p. 125-128, plate 10, fig. 1. 



This variety is represented by several cranidia. 



The type species is fully described by Dr. "Walcott as below. 



"Glabella large truncato-conical in outline, and marked by three pairs of short 

 furrows, the posterior pair of furrows forms a rounded pit near the margin, and continues 

 obliquely outward as a shallow furrow to the cetitral third of the glabella, separating a 

 short, rounded lobe on each side, the middle pair of furrows is short and very slightly im- 

 pressed; the anterior pair of furrows is indicated by a short, smooth narrow space at the 

 anterior fourth of the glabella; occipital furrow of medium width, rounded at the bottom, 

 and rather deep; it curves backward slightly at the sides and then arches gently forward 



