198 PALEOZOIC PALEONTOLOGY. 
depressed. Occipital segment broader than the furrow, produced 
posteriorly at its median point into a short, blunt spine or tubercle. 
Surface of the median and basal lobes of the glabella, the posterior 
portion of the band surrounding the glabella and the occipital seg- 
ment, covered with minute tubercles, which are most abundant upon 
the glabella. The band between the dorsal and marginal furrows, 
in front of the glabella, has a closely-pitted surface. The anterior 
marginal border, the palpebral lobes and the bottom of all the furrows 
are smooth. 
The free cheeks, thorax and pygidium are unknown. 
The dimensions of the largest specimen observed are: total length 
of head, 4.75 mm.; width between palpebral lobes, 5 mm.; length of 
glabella, 3 mm.: width of glabella, 2.33 mm. 
Remarks.—This species is closely allied to C. planifrons Hich. of 
Russia, as described by Fr. Schmidt.* It differs from that species in 
the absence of the abrupt descent of the glabella posteriorly into the 
occipital furrow, and in its different surface markings, the head of 
C. planifrons being covered throughout with scattered tubercles. 
BRONTEUS LUNATUS Bill. 
Plate XV., Figs. 14-16. 
1855. Bronteus lunatus Bill., Geol. Surv. Canada, Rep. Prog., p. 338. 
1863. Bronteus lunatus Bill., Geol. Canada (Logan), p. 188, fig. 187. 
1897. Bronteus lunatus Clarke, Pal. Minn., pt. IT., p. 725, fig. 43. 
Description.—Pygidium subcircular in outline; axis semi-oval or 
subtriangular, partially terminated at a point a little more than one- 
fourth the length of the pygidium from the anterior border and be- 
yond that point continued as a flattened ridge, with slightly diverging 
sides. Pleura marked by six shallow, lateral furrows on each side; 
the first lies parallel with the anterior margin of the pygidium until 
it has proceeded half way to the lateral margin; it then curves back- 
ward and soon becomes obsolete; the second originates in nearly the 
same point with the first, but curves backward more directly; the 
other four are nearly straight and at equal distances from each other, 
but all disappear as they approach the margin. 
* Rey. Ostbalt. Sil. Tril., pt. IV., p. 58. 
