384 The American Geologist. June, 1892 
type A. parvifrons Linrs. which appears with the genus Para- 
dowides in Norway. The pygidium of A. prolongus Hall, pl. x, 
fig. 10, has a similar form to the head of this species. The 
author illustrates only the head. An associated pygidium has a 
prominent axis bordered by a narrow convex space between it 
and the limb. The axis does not exhibit lateral, or transverse 
furrow. An elongated median tubercle is the only ornament. 
PARADOXIDES ZONE. 
Section Il, LONGIFRONTES. ‘This section is distinguished by 
its strongly projecting glabella and axis, which latter is generally 
moderately long. Crustsmooth. The cheeks grooved. The crust 
on the cheeks and pygidium is provided with raised points. 
Limb generally narrow. The cheeks in front of the glabella and 
side lobes of the pygidium, behind the axis, divided by a groove. 
(Agnostus punctuosus Ang., pl. Ix, fig. 2, also A. pistformis pl. 
Ix, fig. 14). 
AGNosTUS ACUTILOBUS Matthew, 1885. Plate 1x, fig. 1. 
Diagnosis. —Body elliptical, elongated. Head semi-elliptical. 
Dorsal furrow faint, marginal furrow and fold sharply defined. 
Glabella subeonical, length $ of that of the head. The glabella 
is divided into two lobes; the anterior lobe is 4 of the length and 
subtriangular, posterior lobe extends to the base of the head. It 
has an elongated ridge on the anterior half, with two faintly 
marked lateral furrows on the lateral edges of this lobe. The 
basal lobes are divided off by a sigmoid furrow and depressed 
below the level of the glabella. Occipital ring narrow. The 
cheeks are somewhat full especially in front and divided by a 
furrow, each cheek is seamed across by a faint furrow. Thorax 
of two segments; the first has five lobes, the second only three. 
Pygidium subelliptical. Axis is oblanceolate, nearly $+ as wide 
as the pygidium and its length is about # of that of the pygi- 
dium, narrowed in the anterior third, and crossed in that part by 
two transverse furrows; the included lobe bears an elongated 
tubercle; lateral lobes of the pygidium moderately elevated and 
united behind the axis. Surface smooth externally, but it is 
granulated on the inner surface of test. 
Locality. St. John group, Porter’s brook, St. Martin’s. 
