Genus Agnostus.— Vogdes. 385 
The species differs in minor points from A. gibbus var. hybridus Broég- 
ger, especially in having an elongated ridge on the front of the posterior 
lobe of the glabella. 
AGNOSTUS OBTUSILOBUS Matthew, 1885.  Plate.1x, fig. 3. 
Cf. A. scarwoides Salter, 1872, from which it differs by a nar- 
rower glabella with a more obtuse front. 
Diagnosis.—The head of this species is like that of A. acuti- 
loba Matthew. The pygidium described under this name is sub- 
quadrate in form, wider behind than before, and has a pair of 
spines at the outer angles. The axis is nearly one-half as wide 
as the pygidium, about four-fifths of its length and projects for- 
ward beyond the side lobes; it is obtusely lanceolate, somewhat 
narrowed in the middle, and divided into three lobes, of which 
the posterior is a 4 longer than the length of the two anterior. 
The middle lobe is elevated in the middle, and bears an elongated 
tubercle on the axial line; there is also a faint tubercular eleva- 
tion on the middle of the anterior lobe. The lateral lobes of the 
pygidium are somewhat narrowed in the middle of their length by 
the projecting sides of the axial lobe, and rapidly behind the 
pygidium, where they connect. he dorsal furrow is deeply im- 
pressed all around, and at the posterior angle is very close to the 
marginal furrow; this furrow is angled forward to the axial lobe 
and quadrately rounded at the posterior side of the pygidium. 
Locality. St. John group, Porter’s and Hanford brooks, St. Martin’s. 
AGNOSTUS TESSELLA Matthew, 1885. Plate 1x, fig. 4. 
Diagnosis.—Head semi-elliptical, higher in the middle and 
rear part. Dorsal furrow distinct on the posterior % of the gla- 
bella, faint on the other 4. Limb strongly elevated; the interior 
groove deep and strongly impressed. Glabella cylindro-conical, 
rounded in front, the width 4 of that of the head; the length five- 
sevenths. The frontal lobe of the glabella is depressed to the 
level of the cheeks, and almost obsolete; the posterior lobe is 
cylindrical, rounded behind, bounded in front by a straight, deep 
furrow, and bears a small tubercle 4 from the front. Basal lobes 
small. Thorax of two segments. The anterior segment bears 
five lobes of which the two lateral pairs are globose; the axis is 
transversely .elongated, wider behind than before, and bears a 
minute tubercle at the axial line. The posterior segment is simi- 
