120 PALEOZOIC PALEONTOLOGY. 
direction, each one extending about one-third the width of the glabella, 
and are sometimes nearly or quite obsolete; the posterior pair are 
always present, although sometimes nearly obsolete, arching back- 
‘wards towards the occipital furrow. Occipital segment separated 
from the glabella by a deep and rather wide occipital furrow, pro- 
duced posteriorly in a broadly-triangular spine, which is slightly at- 
tenuate towards the extremity. Fixed cheeks broad behind, somewhat 
-convex, bending downward to the lateral margins; the frontal limb 
bending upward and forming a rather conspicuous, elevated rim in 
front. Facial sutures slightly curved inward anteriorly and bending 
outward posteriorly to the posterior margin, their direction being 
somewhat sigmoidal. Position and form of pelpebral lobes not defi- 
nitely shown in the specimens. Pygidium small, much broader than 
long, obtusely subangular at its posterior extremity; axis prominent 
and strongly convex, consisting of five segments, with indications of 
a sixth one posteriorly, its posterior extremity abruptly rounded and 
reaching to the posterior margin of the pygidium; plure nearly flat, 
with a slight marginal groove, divided into five segments. 
The approximate dimensions of the largest cranidium observed are: 
length, 6.2 mm.; width, 7.5 mm. 
Remarks.—The true generic position of this species must remain 
‘in doubt until a complete revision of the genera of American Cam- 
brian trilobites has been made. When first described the species was 
referred to Liostracus. This generic reference, however, was evi- 
dently wrong, and is now changed to Solenopleura, which may also 
eventually prove to be an incorrect reference. 
ANOMOCARE PARVULA Ni. Sp. 
Plate TIL, Hig. 22: 
Description.—Cranidium convex, broadly subquadrangular in out- 
line, the anterior margin broadly rounded. Glabella tumid, sub- 
quadrangular in outline, nearly as broad as long, not marked by 
jateral furrows, the sides parallel, the anterior extremity truncated. 
Occipital furrow well defined; margins of occipital segment parallel. 
Fixed cheeks broad, united anteriorly by a broad frontal limb, with a 
convex border along its anterior margin, behind which is a broad, 
concave furrow, becoming convex towards the glabella. Palpebral 
