NO. 1415. CAMBRIAN FAUNAS OF CHINA— WALCOTT. 13 



having a slightly eccentric elevated apex. It does not appear to be 

 identical with ScencIJa cJotho^ of the Chang Hsia formation, as the 

 apex is more eccentric and there is no evidence of any carinas 



Formdfioii and lomJiiy. — Upper Cambrian, lower portion of Chao 

 Mi Tien formation; Pagoda Hill, 1 mile west- southwest of Tai An Fu, 

 Shangtung, China. 



Collected ))y Eliot Black welder, of the Carnegie Institution of 

 Washington Expedition to China. 



Genus STRAPAROLLINA Billings. 

 STRAPAROLLINA CIRCE, new species. 



Shell small, hemispherical, spire depressed and rounded in outline; 

 whorls probably about three; only two are preserved; suture shallow; 

 the whorls are gently and uniformly rounded from the suture down 

 to the more rapid curve to the basal side; as far as can be determined 

 a section of the outer whorl has the form of an ellipse, the narrower 

 parts toward the dorsal furrow and the outer basal margin. 



The greatest diameter of the type and only specimen is 3.5 nun.; 

 greatest diameter near aperture 2 mm. ; diameter of whorl opposite 

 aperture 1.5 mm. 



The surface is marked by concentric elevated lines that extend 

 obliquely backward from the dorsal suture to the base of the whorl, 

 where they are concealed by the matrix. This species differs from 

 StraparolUna remota Billings in the more rapid expansion of the 

 outer whorl and more elevated spire. 



Fonnatioii and locality. — Upper Cambrian, lower portion of Chao 

 Mi Tien formation; Pagoda Hill, 1 mile west-southwest of Tai An 

 Fu, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



STRAPAROLLINA, species undetermined. 



This form is represented by the lower portion of a single whorl, 

 that is rounded in outline and suggestive of StraparoUlna remota. 

 The greatest diameter across the volution is 6.5 mm., and of the 

 whorl 2.5 to 3 mm. 



Formation and locality. — Middle Cambrian, in shales just below 

 the Chao Mi Tien formation, corresponding to the Ku San shales; 

 isolated hills 12 miles S. 80° E. of Tai An Fu, Shangtung, China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



