CAMBRIAN FAUNAS. 121 
lobes prominent, situated nearly opposite the anterior extremity of 
the glabella. Free cheeks, thorax and pygidium unknown. 
The approximate dimensions of the type specimen are: length, 3.25 
mm.; width, 4.5 mm. % 
Remarks.—This species is placed in the genus Anomocare on ac- 
count of its broad frontal limb, a character which it shares with mem- 
bers of that genus. 
DIKELOCEPHALUS NEWTONENSIS Nl. Sp. 
Plate III., Figs. 1-7. 
Description—Head convex, sub-semi-circular in outline. Crani- 
dium irregularly subquadrangular in outline. Glabella moderately 
convex, longer than wide, subquadrangular in outline, the anterior ex- 
tremity somewhat truncated, the lateral margins converging an- 
teriorly; crossed by three transverse furrows, the first of which 
is very faint, but extends continuously across the glabella, its 
lateral extremities directed slightly forward, so that the fur- 
row describes the are of a circle; the second furrow opposite the 
palpebral lobes, parallel with the first, but much more deeply im- 
pressed; the third, or occipital, furrow is usually nearly straight, but 
sometimes with its lateral extremities directed slightly forward, about 
as deeply impressed as the second furrow; occipital segment depressed, 
convex, not rising higher than the glabella in front of it. Fixed cheeks 
less than one-half the width of the glabella, longitudinally convex, 
moderately depressed below the level of the glabella opposite the pal- 
pebral lobes, but more deeply depressed, both anterior and posterior, 
to this point. Palpebral lobes situated at about the middle of the 
length of the head. Frontal limb rather narrow, convex at the mar- 
gin, separated from the anterior extremity of the glabella by a shallow, 
rounded groove. Free cheeks large, with long genal spines, which 
are frequently broken off; convex toward the eyes, with a convex 
marginal border separated from the inner portion of the cheek by 
a rather broad, concave depression. Pygidium subsemi-circular in 
outline, its margin entire, about one and one-half times as wide as 
long; axis prominent, especially posteriorly, tapering gradually to the 
somewhat sharply-rounded posterior end, crossed by five transverse 
furrows, which become more and more nearly obsolete posteriorly ; 
