NO. 4 CAMBRIAN FAUNAS OF CHINA lOT 



Observations. — Fragments of this species are quite abundant in 

 the Hmestones and interbedded shales. A few entire specimens are 

 found in a fine argillaceous shale a short distance above the white 

 quartzite at the base of the section, and it is from the best specimens 

 of these that the above description was drawn, together with speci- 

 mens of the cranidium in the limestone. 



In general outline and appearance Asaphiscus iddingsi approaches 

 the type of the genus, A. wheeleri Meek.' Asaphiscus iddingsi has a 

 genal spine, a longer eye lobe, a proportionately shorter cephalon, 

 and nine, instead of eight, segments in the thorax. 



Formation and locality. — Middle Cambrian : (35r) (36e) Fu-chou 

 series ; shales interbedded with limestones near the base of the 

 series just above the white quartzite, collected in a low bluff on the 

 shore of Tschang-hsing-tau island, east of Niang-niang-kung, Liau- 

 tung, Alanchuria, China. 



Collected by J. P. Iddings and Li San. 



'Walcott, 1886, Bull. U. S. Geol. Survey, No. 30, pi. 31, fig. 3. 



