1896.] | NEW YORK ACADEMY OF SCIENCES. 233 
lobes are densely granulated. In one pygidium the first joint 
[of the rachis] has two lateral elevated points, the middle joint 
near the strongly elevated carina has a point on each side, and 
the last joint is ornamented with an elevated point on each side 
in front, and one median point.” 
Size.—Length and width of the shield 6 mm. 
Horizon and Locality.—In America this species is found at 
Highland Cove, Trinity Bay in company with P. Davidis, etc. 
This fine species is easily recognized by its tuberculate side 
lobes and smooth rachis, and corresponding conditions in the 
head-shield. The somites in the third lobe of the rachis are 
clearly distinguishable in the American, as in the Norwegian ex- 
amples, and-the paired somites in this lobe are parallel to those 
seen in A. Nathorsti, etc. 
AGNOSTUS LH/VIGATUS, Dalman. 
Battus levigatus, Dalm. Vetensk, Skad. Arsber, p. 136. 
Battus levigatus, Hisinger. Lethea Svec., p. 30, tab. iv., fig. 7. 
Agnostus levigatus, Ang. Pal. Scand, p. 6., tab. vi., fig. 3. 
Agnostus levigatus, Broegg, Om. Paradox. skifren p. 74, tab. 
v., fig. 6, and tab. vi., fig. 5. 
Agnostus levigatus, Tullb. Om. Agnostus-anterna, p. 27, tab. ii., 
fig. 17 a and: b. 
The following is Tullberg’s description of this species: “Crust 
usually very smooth and handsome. Head-shield elongate- 
rounded, encircled by a narrow filiform marginal fold. Glabella 
obsolete in front, enclosed by impressed lines behind, rounded 
behind and ornamented with an elevated point. Basal lobes 
rounded, connected behind the glabella, Lateral furrows some- 
times indent the cheeks. Pygidium elongate rounded, enclosed 
by a marginal fold which is broader behind. Rachis vanishing 
backward, the first joint obsoletely three parted, the second or- 
namented with an elevated point, the third narrow, scarcely dis- 
tinguishable.” 
Size.—Leneth of the shields, 5 mm.; width, 4 mm. 
Horizon and Locality.—Head shields of this species occur in 
limestones at Chapel Arm, Trinity Bay, Newfoundland. As we 
have no pygidium they may be of the following variety. 
Var. TERRANOVICUS n. var. Plate xvii., figs. 1 @ and b. 
This variety has the narrow marginal fold of the typical form, 
but differs in the larger basal lobes of the glabella, and in having 
the rachis of the pygidium defined throughout bya distinct fur- 
row. In this respect it approaches more nearly the variety 
