DESCRIPTION OF GENERA AND SPECIES. 193 



In the argillaceous shales interbedded in the limestones carrying the Dorypyge 

 richthofeni fauna which includes . 1 . minus Dames, there are two specimens referred to 

 this species in which parts of the thorax are preserved [figs. ic-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 (Palermo) 

 labradorica oricntalis (Walcott), Iiicuyia ahaiis (Walcott), and Coosia decclus (Wal- 

 cott). In Manchuria, Prof. J. P. Iddings found ,4. minus in association with the 

 Dorypyge richthofeni fauna. 



Formation and Locality. Middle Cambrian: (C9) Lower limestone member of 

 the Kiu-lung group [Blackwelder, 19070, 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 (3(5 h), Fu-chou series, shales about 130 feet (40 m.) above 

 the white quartzite, (3(5o) shales interbedded with limestones, and (35 n) limestones 

 near the base of the series just above the white quartzite [see Blackwelder, 19076, 

 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 1 8, Figure 10. 



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. 



