Foerste.] 
270 
[May 1, 
gidia in the Clinton Group of Dayton, Ohio. Only two or three 
specimens have been found and these seem to be the same as the 
specimens here cited as E. punctatus. 
The following description has been drawn up from the abundant 
material found at Cumberland Gap, Tennessee. 
Glabella anterior to occipital groove obovate, width five-sixths of 
length, the sides slightly incurved, the anterior end forming a semi- 
circle ; the surface covered with medium-sized tubercles ; along the 
sides four much more prominent tubercles occupy the distance from 
the occipital groove to the anterior margin ; between the two an- 
terior lateral tubercles, sometimes a moderate but distinct groove 
proceeds, following the anterior outline of the glabella ; anterior to 
this groove, there is usually an even row of smaller tubercles, 
flanked at either end by the anterior one of the lateral larger tu- 
bercles already mentioned ; including the two lateral tubercles, this 
row, in a glabella 7 mm. broad, would contain about ten or eleven tu- 
bercles. Posteriorly to this groove, the smaller tubercles are of more 
irregular arrangement, excepting that anterior to the occipital 
groove two smaller tubercles usually occupy the space between the 
posterior, larger tubercles thus giving rise to a row of four here. 
Occipital furrow distinct. Dorsal furrows between the glabella and 
the fixed cheeks very deep and fairly narrow. Extension of oc- 
cipital furrow along the posterior margin of the fixed cheeks very 
distinct near the dorsal furrow, less distinct toward the lateral ex- 
tremities. Tubercles of the fixed cheek only distinct near the dorsal 
furrow. Movable cheek with continuation of dorsal furrow, well- 
marked, being thus divided into two parts; the anterior convex, 
the posterior slightly convex, both with tubercles. A lateral groove 
defines a marginal rim along the fixed cheeks, which narrows an- 
teriorly and is supplied with tubercles of variable distinctness. The 
eyes are raised on long and slender stalks. On a fixed cheek 16 mm. 
long, the eyestalk was 1.3 mm. in width, and 4 mm. in length. 
This eye is the distinctive feature of the specimens here described, 
but is not always so greatly elevated. 
The pygidium is slightly broader than long, triangular, strongly 
convex anteriorly, with eight lateral pleurae, and twenty or more 
median segments, the last often very indistinct. The median line 
along these segments in our specimens (casts?) is either depressed 
and vacant or occupied by tubercles. These tubercles occur at va- 
riable intervals, most commonly at every fourth segment, but with 
sufficient irregularity to discredit the value of such features for spe- 
