OF DENISON UNIVERSriY. 
53 . 
Genus 3. Proetus, Steininger, 1830. 
General form oval, head short, pigidiiim longer ; head-shield with 
a raised border and furrow ; angle of free cheeks sometimes pro- 
duced ; basal lobes of glabella distinct, with or without lateral fur- 
rows ; axial furrows distinct, facial suture diverging in front of eyes to 
form prominent palpebral lobes. Free thoracic segments 8-10. 
Pigidium with elevated axis, plurse falling short of margin of the 
pigidium, which usually is smooth. 
Genus 4. Brachymeiopus, M’Coy, 1847. 
Head shield nearly semicircular, acutish in front, one-third wider 
than long; glabella small, about one-half length of head, with basal, 
but no lateral lobes ; facial suture obscure.; angles of cheeks produced; 
surface pustulate ; pigidum with a rounded border, ribs with double 
furrows, surface ornamented. 
The following list embraces all the now recognized species of car- 
boniferous trilobites, so far as can be ascertained. It must be admit- 
ted that many species have been described in this country from frag- 
ments too imperfect or too incomplete to afford adequate means of 
comparison. 
Genus Dalmanites (?) 
I. D. cuyahogce^ Claypole, (Plate II, Fig. 33.) 
Genus Proetes. 
1. P. laevis, Woodward. 
2. P. auriculatis^ Hall. 
3- P. ellipticus, Meek and Worthen. 
Genus Phillipsia. 
European Species. 
Known from heads and pigidia. 
A. Angle of free cheek produced to form a long spine. 
I. Axial lobe of glabella not expanded in front. 
I. P. gemmulifera^ Phillips. Two lateral furrows on the glabella, 
axis of pigidium, with about 18 somites. (Plate VI, 6.) 
3. P. triincatula, Phillips. Three lateral furrows on glabella,, 
axis of pigidium, wirh about r8 somites. (Plate VI, 7.) 
