DESCRIPTION OF GENERA AND SPECIES. 193 
In the argillaceous shales interbedded in the limestones carrying the Dorypyge 
richthofeni fauna which includes A.minus Dames, there are two specimens referred to 
this species in which parts of the thorax are preserved [figs. 1c—-d]._ One of these has 
thirteen segments in the thorax and both show a pleural lobe wider than the axial 
lobe. The pleural portion of the segment has a narrow pleural furrow extending 
from near the front inner margin of the segment diagonally across nearly to the outer 
posterior margin where the slightly falcate termination of the segment curves 
slightly backward. 
The associated species recorded by Dames is Liostracus talingensis Dames. In 
our collections in Shan-tung we find, with A. minus Dames, Micromitra (Paterina) 
labradorica orientalis (Walcott), Incuyia abaris (Walcott), and Coosia decelus (Wal- 
cott). In Manchuria, Prof. J. P. Iddings found A. minus in association with the 
Dorypyge richthofent fauna. 
Formation and Locality —Middle Cambrian: (C9) Lower limestone member of 
the Kiu-lung group [Blackwelder, 1907a, pp. 37 and 39 (third list of fossils), and 
fig. 8a (bed 33), p. 29], 3 miles (4.8 km.) southwest of Yen-chuang, Sin-t’ai district, 
Shan-tung, China. 
Also from Localities (86h), Fu-chéu series, shales about 130 feet (40 m.) above 
the white quartzite, (86e) shales interbedded with limestones, and (85n) limestones 
near the base of the series just 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. 
The type specimens described by Doctor Dames occur in a greenish-brown, 
dense limestone found in a wall at Ta-ling, Province of Liau-tung, southeast of 
Mukden, Manchuria, China. 
Anomocare ? nereis (Walcott). 
Plate 18, Figure 1o. 
Ptychoparia nereis WALCoTT, 1906, Proc. U. S. Nat. Mus., vol. xxx, p. 588. (Described as a new 
species essentially as below.) 
This form is represented by several cephala, exclusive of the free cheeks. 
Glabella and fixed cheeks are moderately convex; glabella prominent, truncato- 
conical, converging very gently from the base to the slightly rounded front; surface 
marked by three pairs of short, very slightly impressed furrows, and a very obscure, 
longitudinal median ridge; occipital furrow shallow but clearly defined; occipital 
ring nearly flat, sloping from the shallow furrow slightly upward to the posterior 
margin it narrows at the sides to two-thirds of its width at the center; dorsal furrow 
narrow, shallow, and clearly defined at the sides of the glabella; in front it is little 
more than the angle formed by the union of the glabella and frontal limb. 
Fixed cheeks narrow, about one-third the width of the glabella, slightly convex 
opposite the palpebral lobes, and merging into the frontal limb in front of the pal- 
pebral ridges, and sloping more gently backward to the posterior furrow; palpebral 
lobes narrow, about one-third the length of the cephalon, and separated from the 
fixed cheeks by shallow furrows; postero-lateral limb short, and marked by a rather 
broad, shallow posterior furrow within a very narrow posterior margin; frontal 
limb short, sloping down to the very narrow, slightly defined furrow that separates it 
from the nearly flat, narrow frontal rim. 
Surface slightly roughened, but from its condition it is impossible to state 
whether it is like the surface of Ptychoparia lilia [plate 12, fig. 12]. The largest 
cephalon in the collection has a length of 3.5 mm. 
