106 RESEARCH IN CHINA. 



Formation and Locality. Middle Cambrian: (CP>) Thin, platy limestone in 

 the upper shale member of the Kiu-lung group [Blackwelder, igoja, 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, China. 



Collected by Eliot Blackwelder. 



Redlichia sp. undt. (i). 

 Plate 7, Figure 15. 



This species is represented by a peculiar free cheek associated with fragments 

 of Redlichia chinensis [p. 104]. It differs from the free cheeks referred to the latter 

 species in having a less pronounced angle between the facial suture and in the genal 

 spine, and in the presence of a sharp spine at the angle formed by the union of the 

 base of the eye-lobe and the facial suture outlining the postero-lateral limb. 



Formation and Locality. Lower Cambrian: (( l(i) Slaty black limestone in the 

 lower part of the Man-t'o shale [Blackwelder, 190702, p. 26, third paragraph, and 

 fig. 6 (bed 7), p. 25], 2 miles (3.2 km.) south of Ch'ang-hia, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Redlichia sp. undt. (c). 

 Plate 7, Figures 16, 160. 



Only one free cheek is known of this form. It is not unlike the free cheek of 

 Redlichia chinensis [p. 104] in outline, but it differs in its strongly tubercular surface 

 slightly defined marginal rim, and narrower body. The associated fragment of 

 the axis of a thoracic segment bearing a strong spine has tubercles on the segment 

 and the base of the spine. 



Formation and Locality. Lower Cambrian : (027) Buff and drab shales in the 

 lower part of the Man-t'o shale [Blackwelder, 19070, p. 26, third paragraph ; and fig. 6 

 (bed 7), p. 25], on crest of ridge at Ch'ang-hia, Shan-tung, China. 



Collected by Eliot Blackwelder. 



Genus ALBERTELLA Walcott. 

 Albertella WALCOTT, 1908, Smithsonian Misc. Coll., vol. 53, No. 2, p. 18. 



Albertella pacifica Walcott. 



Plate 12, Figure 3. 



Albertella pacifica WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, pp. 76-77, plate 14, fig. 6. 

 (Described and discussed as a new species essentially as below.) 



Of this form only one fragment of the pygidium was found in the collection 

 from Manchuria. This is so characteristic that I do not hesitate to identify it as 

 the pygidium of an Albertella, although stratigraphically it occurs at a higher horizon 

 in the Middle Cambrian than the American species of the genus. For the purpose 

 of comparison figures of Albertella helena Walcott and A. boswortki Walcott are 

 inserted on the same plate with A. pacifica. 



A pygidum illustrated by M. Barrande [1852, plate 12, fig. j j] :;- Paradoxides 

 desideratus Barrande may possibly belong to a species of Albc'lAla. The axial 

 lobe of the pygidium has seven rings and a terminal section and the pleural lobes 

 have lateral spines. 



Formation and Locality. Middle Cambrian: (36 f) 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, Chin; 1 . 



Collected by J. P. Iddings and L,i San. 



