Vol 1. 



San — Cambrian Faunas of North China 



(iv) 29 



- : ' The posterior or second lobe, moderately convex in the anterior portion and 

 rsloping down near to the^ broad groove ; and also marked by one pair of oblique crescentic 

 short, broad and slightly impressed furrows. 



Limb very narrow, separated from the axis by a very strong deep furrow, broad 

 in the middle part just opposite the transverse furrow which separates the anterior lobe 

 from the posterior lobe. 



Pygidium bordered by a very broad groove and very narrow rim with a pair 

 ■of very short, backwardly projecting spines on the postero-lateral margins. 



Measurements: — 



No, .513 



No. 514 



The general appearance of the cephalon, and the large axis of the pygidium 

 tjuggest A. chinensis Dames, but it differs from this in the more conical glabella and the 

 detailed character of the axis of the pygidium. Our species, however, is very closely 

 related to that species as figured by Walcott, (Research in China, Vol. Ill, pi. 7, fig. 5 a) 

 but is nevertheless distinct. 



I take pleasure in naming this new species in honor of prof. C. Ho, M ^ dean 

 of the Geological Department of the National University. 



Horizon and Locality: — Early Upper or late Middle Cambrian; abundantly 

 found in the purple shale of the Changshan formation. Collected by Prof. A. W. 

 •Grabau and Dr. F. F. Mathieu. 



Genus DORYPYGE Dames 

 Dorypyge richthofeni Dames 



"" " Plate II, Figs. 3a, d. 



188) Dorypyge richthofeni Dames, China, Richthofen, Vol. IV. p. 24, plate 1, fig. 1-6. 



■u ' 



