24 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



Foiynation and locality. — Middle Cambrian, upper portion of Chang 

 Hsia formation, 3 miles south of Kao Chia Pu. Hsin Tai, Shang-tung, 

 China. 



Collected by Eliot Blackwelder, of the Carnegie Institution of 

 Washington Expedition to China. 



Genus MICRODISCUS (Emmons) Walcott.« 



MICRODISCUS ORIENTALIS, new species. 



There is in the collection but a single specimen of the matrix of a 

 portion of the head of this species. This indicates the head to have 

 been semicircular in outline, Avith a strong, rounded, frontal border, 

 marked by ten or more transverse furrows, very much in the same 

 manner as M. connexus. In front of the border there is a very nar- 

 row, slightly elevated rim. 



Cheeks convex, and sloping from the center toward the narrow, 

 sharp dorsal furrow about the glabella and to the furrow within the 

 border of the head. A very narrow ridge extends just back of the 

 antero-lateral angles of the glabella outward so as to disappear in 

 the ful'row within the outer border. 



Gla])clla very narrow in front, gradually widening toward the base, 

 and from the slight indication in the specimen is continued backward 

 in an occipital spine; it is marked by two transverse, liglitly impressed 

 furrows, and what may be a faintly impressed occipital furrow. 



This species shows characters that occur in two described forms: 

 The border of the head and the occipital spine are much like those of 

 J/! connexus; the transverse furrows of the glabella recall those of 

 some specimens of M. .yx'closus. 



Its occurrence in the Cambrian rocks of China is most interesting. 



The fossils associated in the ])luish-gray limestone are Acrotreta 

 sJidugfiuigeiisls:., DlcelJomus parrns., OlxiJeJla axuitica., (Jhohis shev.siefi- 

 .s'/.y, lli/olit/)cs, undetermined fragments of trilobites, and a small 

 ostracod. 



CoUectcd b}' Bailey Willis and Eliot lUackwelder, of the Carnegie 

 Institution of Washington Expedition to China. 



Forination and locality. — Middle Cam])rian. 



The ty^Q specimen is from dark, bluish-gray, compact limestone, 

 in the river drift of the Lan Ho, near the extreme southeastern 

 corner of the province of Shensi, joining on Hupeh and Ssuch' uan, 

 one mile south of Chen Ping Hsien, Shensi, China. 



Genus REDLICHIA Grossman. 



RedUrlda Grossman, Eevue Critique, Paleozoologie, 1902, Sixit-me Ann., p. 52. 

 ILij'cria Redlicii, Mem. Geol. Sur. India, new ser., I, 1901, p. 2. 

 Not Hcvferia Bittner, 1895. 



"Bull. U. S. Geol. Surv., No. 30, 1886, p. 152. 



