1 92 RESEARCH IN CHINA. 



The pygidium is quite different in outline ; the rounded indented posterior margin 

 of C. (?) limbata [plate 21, fig. 120] is represented by a deep notch that gives a bilobed 

 appearance to the very broad margin ; the axial lobe is also longer and broader than 

 that of C. (?) limbata. The doublure of the pygidium extends close up to the termina- 

 tion of the furrows of the pleural lobe. The pleural lobes of the thoracic segments 

 have a narrow, strong furrow that extends from the inner, anterior margin diagon- 

 ally across nearly to the posterior margin of the backward curving, slightly falcate 

 ends of the segment. 



The stratigraphic position of this species is about 250 feet (79 m.) above the 

 zone of Anomocare latelimbatum Dames. 



The specific name is given in recognition of the excellent work done by Li San, 

 who assisted Professors Willis and Iddings in their collecting. 



Formation and Locality. Middle Cambrian: (35 q) Fu-chou series, about 200 

 feet (61 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. 



Anomocare megalurus (Dames). 



Plate 18, Figures 9, go-/. 

 Lioslracus megalurus DAMES, 1883, China, Richthofen, vol. iv, p. 20, plate i, figs. 7, 8, 10. (Species 



described, discussed, and illustrated.) 



Ptychoparia (Liostractts) megalurus (Dames), WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 9. 

 (Listed under subgenus of Ptychoparia.} 



Numerous fragments of this species occur in a dark shaly limestone in associa- 

 tion with Acrotreta shantungensis Walcott and Obolus chinensis (Walcott). A com- 

 parison of photographs of the type specimens described by Dames with the originals 

 of the figures on plate 18 leads me to place them under the same species. Doctor 

 Dames found fragments of Dorypyge richthofeni Dames associated with this species 

 at Wu-lo-pu. Prof. J. P. Iddings found fragments of the cephalon in the same 

 association on the island of Tschang-hsing-tau, Liau-tung. 



Formation and Locality. Upper Cambrian: (037) Upper part of the Ki-chou 

 limestone [the fossils from this locality are not listed, but the presence of Cambrian 

 strata at the locality is mentioned by Willis and Blackwelder, 1907, p. 146], in 

 dense black limestone nodules in green-gray shales 10 feet (3 m.) below the base of 

 the cliff limestone, 8 miles (12.8 km.) south of Ting-hiang-hien, Shan-si, China. 



Collected by Eliot Blackwelder. 



Also from Locality 35 11, Middle Cambrian, Fu-chou series, limestone near the 

 base of the series just above the white quartzite [see Blackwelder, 19076, p. 92, for 

 general section giving 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. 



The type specimens described by Doctor Dames were found in a light gray 

 limestone at the foot of a limestone cliff at Wu-lo-pu, Province of Liau-tung, south- 

 east of Mukden, Manchuria, China. 



Anomocare minus Dames. 

 Plate 19, Figures i, la-d. 



Anomocare minus DAMES, 1883, China, Richthofen, vol. iv, p. 15, pi. i, fig. 24. (Species described, 

 discussed, and illustrated.) 



A comparison of our specimens with a photograph of one of the type specimens 

 described by Dames indicates that as far as the cranidium can serve for identifica- 

 tion, the specimens from Yen-chuang are specifically similar to those from Ta-ling. 



