214 TRANSACTIONS OF THE [may 18, 
Size.—Length, 6 mm.; width, 2} mm. 
Horizon and Locality.—Found in the fine gray shales of Div. 
1 ¢! at St. John and at Porter’s and Hanford Brook, St. Mar- 
tin’s, N. B., but nowhere plentiful. 
This little species is remarkable for the large size of the gla- 
bella and the rachis; in these features and in the expanded an- 
terior end of the glabella it resembles A. rex, Barr. and A. regius, 
Sjogr., but there are no raised lobes on the cheeks similar to 
those species,and the proportions of the glabella, etc., differ. It 
is nearest the latter species. 
AGNOSTUS REX, Barr, var. TRANSECTUS 0. var. pl., xvi., fig. 2. 
This form differs from the type as described and figured by 
Tullberg in having the first and second segment divided com- 
pletely ; for there is no continuous ridge on the rachis from the 
front to the middle of the shield, as in the type; but the ridge 
arises toward the back of the middle lobe, and thence stretches 
nearly across the anterior segment of the posterior lobe. 
It also differs from the type in the proportionately longer 
rachis, and in the narrowness of the raised area which encloses 
the end of the rachis; here the rachis almost touches the flat- 
tened band which runs around the shield within the margin. 
Size.—Length of pygidium, 64 mm; width, 6 mm. 
Horizon and locality.—Dark gray shales of Div. 1 d!, at Por- 
ter’s Brook, St. Martin’s. Rare. 
AGNosTUs FALLAX, Linrs. pl. xv., figs. 8a and b. 
Agnostus fallax Linrs. Om Vestergot. Cambr. och Silur- 
aflagr., p. 81, tab. ii., figs. 54, 55. 
Agnostus fallax, Brogger, Om. Paradoxid. skifr. ved. Krekling, 
Nyt. Mag., Christiania, 1878, p. 64, tab. vi., fig. 1, 1 a. 
Agnostus fallax, Linrs. Om. faun. i lagr. med Paradox. land. 
Geolog. forenin, Stockholm, 1877, p. 371, pl. 15, fig. 7. 
Agnostus fallax, Tullb. Om Agnostus arterna, p. 31, pl. ii., 
fig. 22. 
The following is Linnarsson’s description of this species: 
“Test smooth. Head-shield subquadrate, surrounded by a 
wide margin glabella bilobed, anterior lobe broad, posterior 
lobe with an indentation on each side in front of the middle, 
furnished with an elevated point behind the middle. Basal lobes 
large triangular. Cheeks confluent in front of the glabella. 
Pygidium subquadrate, surrounded by a marginal fold which 
is broader behind and bidentate. Rachis scarcely three-jointed, 
the first joint with obsolete lateral tubercles, middle joint orna- 
mented with an elevated point.” 
