BULLETIN OF THE LABORATORIES 
II4 
description will be deferred until more and better material is at hand 
for accurate description. Stolz’s Quarry. 
Pygidium, general form semi-elliptical, quite straight along the 
anterior border, rapidly curved at its antero-lateral extremities! Axial 
lobe broad and strong, very prominent in the anterior part, rapidly 
narrowing and becoming low in the middle, and again widening pos- 
teriorly, but not equaling its anterior width ; its width at the anterior 
margin one third the width of the pygidium ; one distinct anterior 
annulation, with apparently a faint indication of a second. Lateral 
lobe with three segments on each side, and each marked by a distinct, 
longitudinal furrow along its middle. At their posterior side the two 
anterior lobes project a little beyond the margin of the pygidium, the 
rest of the outline being regularly rounded. The two anterior seg- 
ments directed backwards, the posterior segment bent first a little out- 
ward then backward, filling up the outline along the contracted middle 
of the axial lobe. Under the exterior crust of the pygidium are a 
series of lamellose striations following the posterior and lateral outline 
of the pygidium and reaching about one-third the length of the pygi- 
dium towards the centre. Surface pustulose as in the first described 
glabella; having been found in the same piece of rock, it is supposed to 
be the pygidium of this species. 
Length of the pygidium, 17 mm.; width, 24 mm. Width of the 
axial lobe anteriorly, 8 mm.; along the contracted portion, 4 mm.; at 
its greatest expansion posteriorly, about 6.5 mm. Stolz’s Quarry. 
Other pygidia presenting the same features found here. 
Locality and position. Stolz’s Quarry, both glabellae and pygidia; 
John Brown’s Quarry, New Carlisle, a glabella, kindly loaned from 
the collection of the Ohio State University, by Prof. Edward Orton. 
Clinton Group. 
(;enus ARIONELI.US, Barrande.. 
rx. Arionet.lus . 
[Plate XIV, Fig. 3. ) 
It would be difficult to tell why the species here described should 
])e })1aced under the geneiic name above mentioned, differing, as it does. 
