OF DENISON UNIVERSITY. 
II7 
Pygidiiim broadly ovate-triangular, the lateral borders flattened, axial 
lobe regularly tapering posteriorly, marked by about thirteen annula- 
tions, which gradually decrease in size posteriorly and end in a spinose 
elevation. This spinose elevation is often accompanied by an upward 
deflection of the border posteriorly and terminates in a minute point at 
the end of the border. Although the pygidia are very abundant no 
spinose projection beyond the border has so far been observed. An- 
tero-lateral margin of pygidium rounded, lateral articulations 
about ten in number, all, except the last three, grooved like the ar- 
ticulations of the thorax, becoming indistinct on the margin of the 
pygidium. 
Head irregularly pustulate (pustules small) except the anterior and 
lateral borders of the head, which are minutely granular. Remain- 
der of the body irregularly pustulate, pustules small, a single pustule 
slightly larger in size on each segment of the'axial lobe of the pygid- 
ium, inconspicuous. 
Small specimen, length of body, about 25 mm.; breadth, 16 mm.; 
length of head, 9 mm., breadth, 15 mm. Head (of usual propor- 
tions), length, 12 mm.; breadth, 20 mm.; convexity, 4 mm.; breadth 
of anterior lobe of the glabella, 10 mm.; of the posterior lobe, 5^ 
mm. Pygidium, length, 17 mm.; breadth, 22 mm.; breadth of 
axial lobe anteriorly, 6 mm. 
The furrows across the axial lobe are much more distinct at the 
sides than at the middle, especially in the pygidium. The anterior 
lobe of the glabella has near its posterior extremity a distinct, elongated 
pit, which seems to be characteristic of this species. 
Locality and position. Soldiers’ Home Quarries. Clinton Group. 
(Named in honor of Mr. W. B. Werthner, who was present at the first 
discovery of this species. Abundant in some localities.) 
In connection with the minute forms described above from the 
Beavertown marl, the following will be of interest : 
GENUS ORTHOCERAS, Breynius. 
Orthoceras inceptum, sp. n. 
{Plate XIII, Pigs, i a, b, c.) 
Shell very small and slender, enlarging from below upwards gradu- 
ally, in one specimen from 4 to 5 mm. in a length of 10 mm., in others 
more slowly. Transverse section almost circular, one diameter slight- 
