DESCRIPTION OF GENERA AND SPECIES. 199 
as long as the width of the glabella, narrow, and marked by a longitudinal groove; 
in front of the glabella a narrow frontal limb slopes downward to a slightly convex, 
flattened frontal rim about three times as long as the frontal limb. 
Surface minutely punctate. 
Length of the largest cephalon, exclusive of the occipital spine, 8 mm. 
This little species appears to be quite distinct from any other form of the genus. 
Its narrow fixed cheeks, relatively large eye-lobe, and flattened frontal rim are the 
characteristics upon which it is referred to Anomocarella. 
Formation and Locality—Middle Cambrian: (C2) Lower shale member of the 
Kiu-lung group [Blackwelder, 1907a, pp. 37 and 40 (part of the third list of fossils), 
and fig. 10 (beds 4 and 5), p. 38)], 2 miles (3.2 km.) south of Yen-chuang, Sin-t’ai 
district, Shan-tung, China. 
Collected by Eliot Blackwelder. 
Anomocarella butes (Walcott). 
Plate 19, Figures 7, 7a~—d. 
Anomocare (?) butes WALCOTT, 1905, Proc. U. S. Nat. Mus., vol. xx1x, p. 49. (Described as a new 
species essentially as below.) 
General form of cephalon semicircular, moderately convex. Glabella sub- 
quadrilateral in outline, narrowing slightly toward the nearly transverse front; 
marked by three pairs of slightly impressed, short furrows and a low, narrow median 
ridge; occipital furrow shallow, rounded, and arching very slightly toward the 
center; occipital ring slightly convex and of moderate width throughout, marked 
by a minute, pointed node at the center; dorsal furrow rounded, distinct. 
Fixed cheeks less than one-half the width of the glabella; they rise with a gentle 
slope from the dorsal furrow to the furrow within the rim of the palpebral lobe; 
slope back into the postero-lateral limb, and somewhat abruptly downward in front 
of the palpebral ridge into the frontal limb; palpebral ridge clearly defined and 
merging into the rim of the palpebral lobe; the latter is a little more than one-third 
the length of the cephalon; postero-lateral limb nearly as long as the width of the 
glabella at the base, narrow, and marked by a strong groove within the rounded 
posterior margin; frontal limb slightly convex and curving downward to the flat- 
tened frontal rim; the rim is a little longer than the length of the limb in front of 
the glabella, and the line of demarcation between the limb and the rim is little more 
than the angle formed by the union of the nearly flat rim with the inclined frontal 
limb. 
Free cheeks irregularly triangular; marginal border flattened, strong, and pro- 
duced behind into a strong, flattened spine; central area slightly convex, and rising 
rather abruptly to the base of the eye-lobe; anteriorly the border of the cheeks 
narrows to a slender point. 
Thorax unknown. 
Associated pygidium semicircular in outline, convex; axis convex about two- 
thirds the length of the pygidium, and divided by four furrows into four rings and a 
terminal, longer ring, upon which a slight depression on each side indicates a fifth 
furrow; the pleural lobes extend out about one-half of the distance nearly flat, 
and then curve somewhat abruptly downward to a rather broad, flattened margin, 
into which they merge; the four grooves on the axis and the fifth groove just within 
the interior margin extend across the pleural lobes, fading out on the flattened 
margin. ‘Twosmall nodes occur at the posterior end of the axis, through which a low, 
broad, rounded ridge extends backward and downward into the flattened margin. 
