DESCRIPTION OF GENERA AND SPECIES. 125 
Damesella bellagranulata Walcott. 
Plate 9, Figures 8, 8a—b. 
Damesella bellagranulata WaLcoTT, 1905, Proc. U. S. Nat. Mus., vol. xxix, p. 38. (Described and 
discussed as a new species essentially as below.) 
This species is represented by the central portions of the cephalon, exclusive of 
the free cheeks. These parts indicate that the cephalon was transversely semicir- 
cular and moderately convex. Glabella truncato-conical, moderately convex, and 
marked by two pairs of very faintly indicated, short furrows; occipital furrow nar- 
row, transverse, clearly defined; occipital ring of moderate width and slightly convex; 
dorsal furrow clearly defined on the sides of the glabella; frontal border narrow, 
rounded. 
Fixed cheeks of nearly the same width as the glabella opposite the palpebral 
lobes; they slope up very slightly from the dorsal furrow to the palpebral lobe, and 
gently backward to the slight furrow within the posterior margin; to the front they 
curve down rather rapidly to the frontal border; palpebral ridge narrow and faintly 
defined ; palpebral lobe a little more than one-fourth the length of the cephalon, ris- 
ing somewhat abruptly from the plane of the fixed cheeks; postero-lateral limb, from 
the dorsal furrow to its extremity, about the same length as the width of the glabella 
at its base; it is marked by a shallow, narrow furrow some distance within the pos- 
terior margin. 
The surface is ornamented by rather large, closely arranged pustules that cover 
the glabella and fixed cheeks; the pustules are larger on the occipital segment and 
its extension on the postero-lateral limbs and on the frontal border; larger pustules 
are also scattered on the back portion of the head near the dorsal furrow. Over the 
spaces between the larger pustules and on the pustules there is a minute granulation 
that gives a very highly ornamented surface under a strong lens. 
The type and only specimen of the cephalon in the collection has a length of 
12 mm., of which the glabella occupies 9 mm.; the width at the outside of the pal- 
pebral lobes is 17 mm. and at the ocular ridges 5.5 mm. 
The cephalon of this species is much like that of Damesella blackwelderi in gen- 
eral form, but it differs in the elevated eye-lobes and the peculiarly ornamented, 
pustulose surface. 
Formation and Locality—Middle Cambrian: (C13) Yellow slabby limestone 
in the middle limestone member of the Kiu-lung group [Blackwelder, 19074, pp. 37 
and 41 (part of first list of fossils)],on the west slope of hill in angle between two faults 
just east of the granite mass of the Lién-hua-shan, 6 miles (9.6 km.) southwest of 
Yen-chuang, Sin-t’ai district, Shan-tung, China. 
Collected by Bailey Willis. 
Damesella blackwelderi Walcott. 
Plate 10, Figures 1, 14-7. 
Damesella blackweldert WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xx1x, p. 35. (Described and dis- 
cussed as a new species essentially as below.) 
General form ovate, moderately convex; distinctly trilobed, the central axis 
rather convex and the pleural lobes more or less flattened. 
Cephalon transversely semicircular; frontal margin rounded and narrow in 
young individuals, becoming broader and more flattened with increase in size; it 
continues around the sides and the postero-lateral angle to unite with the narrow- 
ing posterior margin. A postero-lateral spine projects backward and slightly out- 
ward from a point on the margin a little in advance of the postero-lateral angle. 
