DESCRIPTION OF GENERA AND SPECIES. 203 
lobes to the broadly rounded front. The palpebral lobes and posterior portions of 
the cephalon are broken away in the only specimen known. 
This species is associated with Anomocare minus Dames [1883, p. 15], from 
which it differs in the character of the frontal limb and margin, in which respects it 
also differs from Anomocarella temenus [plate 20, fig. 7] and Anomocarella tatian 
[plate 21, fig. 1]. It may also be compared with the form from the St. Croix sand- 
stones of Wisconsin, illustrated by James Hall as ‘‘Conocephalites diadematus”’ 
[1863, plate 7, figs. 36, 37], from which it differs in having a convex instead of a con- 
cave frontal rim. 
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, Shan-tung, China. 
Coosia robusta Walcott. 
Plate 21, Figures 9, 9a. 
Coosia robusta WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, p. 97, plate 16, figs. 2, 2a. 
(Described and discussed as a new species essentially as below.) 
Of this species the cranidium and pygidium are known. ‘The cranidium differs 
from that of C. superba [plate 21, fig. 6] in having a proportionately more elongate 
glabella, more convex frontal border, and narrower postero-lateral limb. 
The pygidium differs in being more elongate, in having a proportionately longer 
axial lobe, and less flattened pleural lobes. 
Formation and Locality—Middle Cambrian: (107) Rome formation limestone 
at Bull Run, northwest of Copper Ridge [Keith, 1896, areal geology sheet], 11 miles 
(17.6 km.) northwest of Knoxville, Knox County, Tennessee. 
Collected by Cooper Curtice. 
Coosia superba Walcott. 
Plate 21, Figures 6, 6a. 
Coosia superba WALCOTT, 1911, Smithsonian Misc. Coll., vol. 57, No. 4, pp. 94-97, plate 16, figs. 1, 
1a. (Described and discussed as a new species essentially as below.) 
Dorsal shield large, elongate-elliptical in outline; axial lobe of medium width, 
conical, and narrowing from the cephalon gradually to the middle of the pygidium, 
where it disappears. 
Cephalon semicircular in outline, moderately convex, genal angles unknown. 
The facial sutures cut the posterior margin some distance within the outer margin 
and extend inward and forward with a slight sigmoid flexure to the base of the 
palpebral lobe; arching about this, they extend downward and with a gentle outward 
curve across the frontal limb and then curve inward across the broad frontal margin. 
Cranidium with a rather large, subconical, moderately convex glabella that shows 
very slight traces of lateral furrows. Occipital ring separated from the glabella by 
a furrow that is rather shallow and nearly transverse; occipital ring slightly convex 
and of nearly uniform width. Fixed cheeks narrow, about one-fourth or less of the 
width of the glabella; posteriorly they merge into the large subtriangular postero- 
lateral limbs, which are marked by a shallow, intermarginal posterior furrow; 
anteriorly the fixed cheeks pass gently down and merge into the frontal limb. 
Palpebral lobe small, less than one-fifth the length of the cephalon; it is continued 
in a low ridge diagonally across the fixed cheek to the antero-lateral margin of the 
glabella. Frontal limb less than one-half the width of the broad, gently convex 
frontal border; in front of the glabella it slopes gently downward to a shallow furrow 
that serves to distinguish it from the frontal border. Free cheeks unknown. 
