142 RESEARCH IN CHINA. 



Formation and Locality. Middle Cambrian: (018) Dark gray oolitic lime- 

 stone about 400 feet (120 m.) above the base of the Ch'ang-hia limestone [Black- 

 welder, 19070, p. 33 (third list of fossils)], in cliffs i mile (1.6 km.) east of Ch'ang-hia, 

 Shan-tung, China; also (071), massive cliff-making limestone in the central portion 

 of the Ki-chou formation [Willis and Blackwelder, 1907, pp. 139 and 145 (second 

 list of fossils)], 4 miles (6.4 km.) southwest of Tung-yii, Shan-si, China. 



Collected by Bailey Willis and Eliot Blackwelder. 



This species appears to be present in the two following localities, but the mate- 

 rial is too poor to decide with certainty: 



Middle Cambrian: (021) Ocher-mottled phase of purple-gray limestone in 

 the middle of the oolitic Ch'ang-hia formation [Blackwelder, 19070, p. 33 (second 

 list of fossils)], at Ch'ang-hia, and (C26) near the top of the black oolite group in 

 the uppermost layers of the Ch'ang-hia limestone [idem (part of the last list of 

 fossils)], 2 miles (3.2 km.) north-northeast of Ch'ang-hia, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Crepicephalus magnus Walcott. 

 Plate 13, Figures 15, 150-6. 



Crepicephalus magnus WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 93. (Described as a new 

 species essentially as below.) 



The only portions of this species in the collection are a fragment of the posterior 

 portion of the glabella and the outer portion of a large free cheek; the fragment 

 shows that the glabella has a width at the base of 12 mm. ; also, that there was a 

 narrow, strong occipital groove and an occipital ring over 3 mm. in width. 



The surface of the fragment of the glabella is marked by strong pustules, which 

 give it a somewhat granulose appearance. The cast of the fragment of the interior 

 of the free cheek indicates that it was pustulose and that the postero-lateral angle 

 terminated in a long, curved spine. 



The two fragments described are so distinctly marked by the coarse granulation, 

 and the free cheek by its curved terminal spine, that there is little danger of con- 

 fusing it with any other species. 



Formation and Locality. Middle Cambrian: (048) 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, China. 



Collected by Eliot Blackwelder. 



At a higher horizon in the Ch'ang-hia limestone a portion of a free cheek 

 [fig. 150] and a fragment of a glabella occur that may belong to this species. 



Formation and Locality. Middle Cambrian: (025) Limestone about 50 feet 

 (15 m.) below the Ku-shan shale in the uppermost beds of the Ch'ang-hia formation 

 [Blackwelder, 19070, p. 33 (part of the last list of fossils)], at Ch'ang-hia, Shan-tung, 

 China. 



Collected by Eliot Blackwelder. 



Fragments of a strongly tuberculated free cheek occur in the Ch'ang-hia lime- 

 stone at a horizon between (( ' 48) and (0 25) that appear to be similar to fragments 

 of the free cheek from these horizons. 



Formation and Locality. Middle Cambrian: (CIS) Dark gray oolitic lime- 

 stone about 400 feet (120 m.) above the base of the Ch'ang-hia limestone [Black- 

 welder, 19070, p. 33 (third list of fossils)], in cliffs i mile (1.6 km.) east of Ch'ang- 

 hia, Shan-tung, China. 



Collected by Eliot Blackwelder. 



