70 RESEARCH IN CHINA. 
relatively broader in outline, with the sides of the valves less uniformly arched, 
and in having a more broadly rounded frontal margin. 
Interiors of the ventral valve indicate that the area was relatively shorter 
than that of L. similis (Walcott) [1912b, plate xx, figs. 2, 2a-j, 3, 3a—d]. Most of 
the shells in the limestone are less than 2 mm. in length; a few ventral valves in the 
shale are 3 to 5 mm. long. 
Formation and Locality—Middle Cambrian: (85q and 36h) Fu-chéu series; 
about 200 feet (61 m.) above the white quartzite; also in shales about 130 feet 
(40 m.) above the white quartzite [see Blackwelder, 1907), p. 92, for general section 
showing 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. 
A form flattened in the shale of Locality 36f, which is much higher but in the 
same section as the locality represented by L. marcia, has the outline of the latter 
species and is tentatively referred to it. This gives an extended stratigraphic 
range for the species, but not so great as L. similis (Walcott) [1912b, pp. 532-534], 
which occurs in both the Middle and Upper Cambrian. 
LINGULEPIS Hall, subgenus of LINGULELLA. 
For discussion of subgenus Lingulepis see Monogr. U. S. Geol. Survey, vol. 1, 
1912, pp. 544-545. 
Lingulella (Lingulepis) eros (Walcott). 
Plate 3, Figures 2, 2a. 
Obolus (Lingulepis) eros WALCOTT, 1905, Proc. U.S. Nat. Mus., vol. xxvitl, p. 333. (Described and 
discussed as below as a new species.) 
Lingulella (Lingulepis) eros (WALCOTT), 1912, Monogr. U. S. Geol. Survey, vol. LI, p. 551, plate xxxIx, 
figs. 9 and 9a. (A copy of the preceding reference.) 
Ventral valve elongate with rostral slopes gradually converging so as to form 
an acuminate beak. Surface marked by fine, concentric lines of growth and very 
fine, somewhat irregular, concentric strie. Rather large, scattered puncte occur on 
the interior surface. 
This species is represented by fragments and two broken ventral valves; these 
indicate a length for the ventral valve of 7 to 10 mm. 
It is allied to Lingulepis acuminatus meeki (Walcott)' of the Middle Cambrian 
fauna of the Teton Mountains of Wyoming. 
Formation and Locality—Middle Cambrian: (C7) Lower limestone member 
of the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 39 (last list of fossils), and 
fig. 8a (bed 33), p. 29], 2.2 miles (3.5 km.) southwest of Yen-chuang, Sin-t’ai district, 
Shan-tung, China. 
Collected by Eliot Blackwelder. 
Lingulella (Lingulepis?) sp. undt. (Walcott). 
Obolus (Lingulepis ?) sp. undt. WaLcottT, 1906, Proc. U. S. Nat. Mus., vol. xxx, pp. 567-568. (Char- 
acterized as on page 71 as an independent species.) 
Lingulella (Lingulepis) sp. undt. (WaLcoTT), 1912, Monogr. U.S. Geol. Survey, vol. LI, p. 560, plate 
XXXIX, figs. 9 and 9a. (A copy of the preceding reference.) 

1Lingulepis meekt Walcott, 1897, Am. Jour. Sci., 4th ser., vol. 1m, p. 405. 
