DESCRIPTION OF GENERA AND SPECIES. yal 
Surface smooth under a strong lens. 
The largest of three specimens of a cephalon has a length of 20 mm., with a 
width at the palpebral lobes of 26 mm. 
This species is characterized by its large size, concave frontal rim, and nearly 
smooth glabella. A somewhat similar cephalon occurs in the upper portion of 
the Ch’au-mi-tién limestone, at about the same horizon, 9 miles (14.4 km.) north 
of Sin-t’ai-hién. 
Formation and Locality—Upper Cambrian: (C64) Upper limestone member 
of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 42 (first list of fossils), and 
fig. 10 (bed 20), p. 38], 2.7 miles (4.3 km.) southwest of Yen-chuang; (C61), a dense 
black limestone in the uppermost limestone member of the Kiu-lung group [idem, 
pp. 37 and 41 (third list of fossils), and fig. 10 (bed 13), p. 38], 3 miles (4.8 km.) 
southwest of Yen-chuang, Shan-tung; and (C11), crystalline limestone 60 feet (18 m.) 
above the base of the uppermost limestone member [idem, pp. 37 and 41 (last list of 
fossils)], 2.1 miles (3.4 km.) southwest of Yen-chuang, Sin-t’ai district, Shan-tung; 
also (C38qa), talus near the base of the cliff of Ch’au-mi-tién limestone [idem, p. 41 
(part of last list of fossils)], 9 miles (14.4 km.) north of Sin-t’ai-hién, Shan-tung, China. 
Collected by Eliot Blackwelder and Li San. 
A form apparently identical was found by Mr. Blackwelder in limestone blocks 
in talus at (C44), 200 feet (60 m.) above the top of the section containing C46, (48, 
and C51, at Ch’au-mi-tién, Ch’ang-hia district, Shan-tung, China. 
Chuangia fragmenta Walcott. 
Plate 16, Figure 2. 
Chuangia fragmenta WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, p. 84, plate 15, fig. 4. 
(Described and discussed as a new species essentially as below.) 
Only a fragment of the cephalon of this species is known. ‘This suggests the 
glabella of Chuangia batia, but the narrow fixed cheeks serve to distinguish it. 
The surface is smooth to the unaided eye, and slightly pitted or punctate under a 
strong lens. ‘The fragment of the cephalon has a length of 16 mm. 
Formation and Locality—Upper Cambrian: (C61) A dense black limestone in 
the uppermost limestone member of the Kiu-lung group [Blackwelder, 1907a, pp. 37 
and 41 (third list of fossils), and fig. 10 (bed 13), p. 38], 3 miles (4.8 km.) south- 
west of Yen-chuang, Shan-tung, China. 
Collected by Li San. 
Chuangia nais Walcott. 
Plate 16, Figure 1. 
Chuangia nais WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, pp. 84-85, plate 15, fig. 6. 
(Described and discussed as a new species essentially as below.) 
This is a large species that is represented by a part of the central portions of 
the cephalon. Glabella subquadrangular, moderately convex, narrowing slightly 
toward its broadly rounded front; without glabellar furrows as far as can be deter- 
mined; occipital furrow shallow, rather broad, and nearly transverse; occipital 
ring gently convex, and slightly wider toward the center; dorsal furrow shallow and 
clearly defined. 
Fixed cheeks about two-thirds the width of the glabella, nearly flat between 
the glabella and the palpebral lobes, and sloping downward in front to the frontal 
rim, and back to the posterior furrow; palpebral lobe small; palpebral ridge narrow, 
low, and situated so as to cross the fixed cheek obliquely where the downward slope 
to the front is most marked; postero-lateral limb long, with a strong furrow within 
