CAMBRIAN FAUNAS. 119 
rather broad and shallow; occipital segment produced posteriorly at 
the centre, into a short, blunt protuberance, scarcely to be called a 
spine, and narrowing towards the sides. Dorsal furrow shallow, but 
fairly well defined. Fixed cheeks about one-half as wide as the 
glabella at the posterior margin of the head, narrowing anteriorly 
and merging into the frontal hmb. Palpebral lobes small, situated a 
little anterior to the middle of the head. The frontal imb one-fourth 
to one-sixth the length of the head, curved downward to the anterior 
borders, without any marginal furrow. Free cheeks convex, irregu- 
larly triangular in outline, without a marginal furrow or border, with 
a short, rounded, genal spine. Pygidium sub-semi-circular in out- 
line, strongly convex, marginal furrow slight or entirely obsolete; 
axial lobe occupying nearly one-half the entire width and reaching 
to the posterior margin, divided by four transverse furrows, of which 
the two anterior ones are much the stronger; plure crossed by two 
furrows corresponding to the two anterior ones of the axial lobe. 
The approximate dimensions of a large head are: length, 14.5 mm.; 
width, 24 mm. 
Remarks.—This species was first described by Walcott from near 
Saratoga Springs, New York. In the original description mention 
is made of indistinct, glabellar furrows, but they are not shown in 
the illustration accompanying the description, and are wholly absent 
from the New Jersey specimens. The pygidia associated with the 
New Jersey specimens does not entirely agree with the description of 
that portion of the species as it occurs at Saratoga, the transverse 
furrows being much less conspicuous. Notwithstanding these dif- 
ferences, the specific identity of the specimens from the two localities 
can scarcely be questioned. Most of the specimens observed are 
smaller than the one illustrated, some of them being less than 5 mm. 
in length. 
SOLENOPLEURA JERSEYENSIS Weller. 
Plate II., Figs. 1-8. 
1899. Lnostracus? jerseyensis Weller, Geol. Surv. N. J., Ann. Rep. 
of State Geol. for 1899, p. 51, pl. 1, figs. 1-8. 
Description.—Glahella large and prominent, longer than wide, sub- 
quadrangular or subelliptical in outline, marked by two pairs of faint, 
lateral furrows, of which the anterior pair are transverse in their 
