TERMINOLOGY. 291 



C70 (35 feet below C69, same section). Middle Cambrian: Oolitic limestone about 30 feet above the base of the 

 Kichou limestone [Willis and Blackwelder, 1907, p. 144, last list of fossils], 4 miles (6.4 km.) south-south- 

 west of Tungyu, Shansi, China (Eliot Blackwelder, 2-21-1904). 



Obolus sp. undt. 

 Scenella? dilatatus Walcott ■ 

 Stenotheca? simplex Walcott. 

 Aaraulos vicina Walcott. 



Inouyia capax (Walcott). 

 Inouyia melie (Walcott). 

 Conocephalina maia (Walcott). 

 Conocephalina sp. 



C71 (about 50 feet below the horizon of C37 and C72, same section; about 125 feet above C75, different section). 

 Middle Cambrian: Massive cliff -making limestone in the central portion of the Kichou formation [Willis 

 and Blackwelder, 1907, pp. 139 and 145 (second list of fossils)], 4 miles (6.4 km.) southwest of Tungyu, 

 Shansi, China (Bailey Willis and Eliot Blackwelder, 2-21-1904). 



Obolus shansiensis?. 

 Acrotreta shantungensis. 

 *Yorkia? orienta,lis. 

 Eoorthis sp. undt. 

 Orthotheca glabra Walcott. 

 Agnostus chinensis Dames. 



Dorypyge richthofeni Isevis Walcott. 

 Anomocarella bigsbyi (Walcott). 

 Anomocarella comus (Walcott). 

 Anomocarella undata (Walcott). - 

 Solenoplem-a pauperata Walcott. 

 Crepicephalus damia Walcott. 



C72 (about same horizon as C37, same section; about 50 feet above C71, same section; about 200 feet below C73, 

 same section; about 225 feet below C74, same section). Middle Cambrian: Thin green-gray limestone 

 interbedded with ocherous and green clay shales overlying the massive oolite in the Kichou formation 

 [Willis and Blackwelder, 1907, pp. 139 and 145 (third list of fossils)], 4 miles (6.4 km.) east of Fanglanchon, 

 Shansi, China (Eliot Blackwelder, 2-22-1904). 



Obolus sp. undt. 



*Lingulella (Lingulepis?) sp. undt. 

 Platyceras willisi Walcott. 

 Orthotheca glabra Walcott. 



Dorypyge richthofeni Isevis Walcott. 

 Anomocare flava Walcott. 

 Ptychoparia nereis Walcott. 

 Conocephalina sp. undt. (Walcott). 



C74 (about 225 feet above the horizon of C37 and C72, same section; about 25 feet above C73, same section). Upper 

 Cambrian: A dense blue dolomitic limestone at the top of the Kichou limestone [Willis and Blackwelder 

 1907, pp. 139 and 145 (fifth list of fossils)], 4 miles (6.4 km.) east of Fanglanchon, Shansi, China (Eliot 

 Blackwelder, 2-22-1904). 



Eoorthis kayseri. 



Ptychaspis bella Walcott. 



C75 (about 125 feet below C71, different sections). Middle Cambrian: Limestone near the base of the Kichou 

 formation [Willis and Blackwelder, 1907, p. 143], 4.5 miles (7.2 km.) south of Wutaihien, Shansi, China 

 (Eliot Blackwelder, 2-13-1904). 

 Obolus obscurus. 

 *Eoorthis kichouensis. 

 Coscinocyathus elvira Walcott. 

 Inouyia armatus (Walcott). 



Inouyia melie (Walcott) . 

 Agraulos nitida Walcott. 

 Agraulos uta Walcott. 

 Ptychoparia lilia Walcott. 



ZOOLOGICAL DISCUSSION. 



Tlie zoological relations of the Cambrian Brachiopoda, or their consideration from the 

 paleozoologist's standpoint, are discussed under four general headings: (1) Characters of the 

 shells, including the terminology adopted in describing them; (2) distribution in Cambrian 

 strata; (3) evolution; and (4) classification. Under evolution no general description of the 

 evolution of the Brachiopoda is attempted, nor is the life history of the living species treated. 

 The discussion is limited to certain observations on the Cambrian species and genera that 

 appear to add to our general knowledge of the subject. 



TEEMINOLOGY. 



GENERAL STATEMENT. 



Except for the muscle scars of the inarticulate brachiopods, the terms used in the descrip- 

 tion of genera and species are largely those defined by Schuchert [1897, pp. 73-75]. For the 

 Atremata and Neotremata the terminology proposed by William King [1873, pp. 5 and 6] is 

 adopted, and for the Protremata that used by Hall and Clarke [1892a, pp. 183-188] and given 



