130 RESEARCH IN CHINA. 



been determined. Doctor Monke compares Drepanura with Tcinistion and the 

 Scandinavian genera Acerocare and Peltura. 



Formation and Locality. Middle Cambrian: (C'<>) Thin, platy limestone in 

 the upper shale member of the Kiu-lung group [Blackwelder, 19070, pp. 37 and 

 41 (second list of fossils), and fig. 10 (bed 12), p. 38], 2.5 miles (4 km.) southwest of 

 Yen-chuang, Sin-t'ai district, Shan-tung; and (C55), just below the Ch'au-mi-tien 

 limestone in the Ku-shan shales [idem, p. 43], in isolated hills at an elevation of 

 380 feet (114 m.) above the W6n-ho, 12 miles (19 km.) south 80 east of Tsi-nan, 

 Shan-tung, China. 



Collected by Bailey Willis and Eliot Blackwelder. 



Also from (36f), Fu-chou series; about 1,000 feet (305 m.) above the white 

 quartzite [see Blackwelder, 19076, p. 92, for general stratigraphic relations], collected 

 in a low bluff on the shore of Tschang-hsing-tau Island, east of Niang-niang-kung, 

 Liau-tung, Manchuria, China. 



Collected by J. P. Iddings and Li San. 



Genus PTYCHOPARIA Corda. 



Ptychoparia CORDA, 1847, Prodrom einer Monographic der bohmischcn Triboliten, p. 141. (Proposes 



Ptyckoparia for generic group of trilobites represented by Conocephaliles stria/us Ernmrich and 



gives diagnosis of genus.) 

 Ptychoparia Corda, WALCOTT, 1884, Bull. U. S. Geol. Survey No. 10, On the Cambrian Faunas of 



North America, pp. 34-36. (Compares and discusses genus.) 

 Ptychoparia Corda, LORENZ, 1906, Zeitschr. deutsch. geol. Gesellsch., vol. LVIII, pt. 2, p. 57. (Quotes 



Corda's diagnosis and adds "dense shell structure" as a generic character.) 



Many authors have referred to the genus Ptychoparia. I will not enter into 

 a discussion of it at this time, as I am planning to give the genus more extended 

 consideration in connection with the description of a number of new species from 

 North America. 



In this memoir the genus is restricted to species having the characteristics of 

 Ptychoparia striata Emmrich. One character should be noted. The increase in 

 the length of the palpebral lobe from the short lobe of P. striata [plate 12, fig. 4] 

 to the proportionately longer lobe of P. kingi [fig. 6] is marked. In P. striata the 

 cephalon is four and a half times as long as the palpebral lobe, and in P. kingi it 

 is three times as long. This elongation of the palpebral lobe is continued in Cono- 

 cephalites emmrichi Barrande [plate 13, fig. 7] and other species grouped under 

 Conokephalina. 



In Walcott, 19056 [Proc. U. S. Nat. Mus., vol. xxix, p. 81], an undetermined 

 species of Ptychoparia was described, based on a single specimen of the central por- 

 tion of a cephalon, from the Middle Cambrian, Locality C58, upper portion of the 

 Ch'ang-hia formation, near the middle of the Ch'ang-hia oolitic limestone, 2 miles 

 (3.2 km.) south-southeast of Kao-kia-p'u, Shan-tung. The specimen upon which 

 this species was determined was lost or misplaced before the final study of the fauna. 



There is also another undetermined species of Ptychoparia, from Locality 048, 

 which shows only the narrow portions of the cranidium and part of a fixed cheek. 



Formation and Locality. Middle Cambrian: (C48) Near the top of the cliffy 

 oolitic limestone in the Ch'ang-hia limestone [Blackwelder, 19070, p. 32 (part of last 

 list of fossils)], at Ch'au-mi-tien, Shan-tung. 



Ptychoparia aclis Walcott. 



Plate 12, Figures 8, 8a. 



Ptychoparia adis WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 75. (Described as a new species 

 as below.) 



Only the slightly convex central portions of the cephalon of this species are 

 known. The species is distinguished by the breadth of the glabella in front, and 



