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PALEOZOIC PALEONTOLOGY. 
Pygidium semi-circular in outline, with a prominent axis, bearing © 
about nine annulations; the plure each have about five or six segments 
grooved along their median line. 
The dimensions of an average adult head are: length, 13 mm.; 
width, 22 mm. 
Remarks.—Fragments of this species are not uncommon, especially 
in the more calcareous beds of the New Scotland formation and in the 
Becraft limestone. 
DALMANITES PLEUROPTYX (Green). 
Plate XXXIX., Figs. 9-10. 
See, also, p. 295, pl. XXXII. 
The fragmentary remains of this species are somewhat more common 
in the New Scotland beds, especially in the lower cherty lmestone 
member, than in the Coeymans limestone. Fragments of both the 
head and the pygidia have been observed, but their condition of 
preservation is always very poor. 
DESCRIPTION OF SPECIES IN THE LOWER ORISKANY OR DALMANITES 
DENTATUS FAUNA. 
MOLLUSCOIDEA. 
BRYOZOA. 
VERMIPORA SERPULOIDES Hall. 
Plate XLI., Fig. 1. 
1887. Vermipora serpuloides H. & S., Pal. N. Y., vol. VI., p. 5, pl. 
2, figs. 24-31. 
Description.—‘Corallum ramose, composed of contiguous, sub- 
cylindrical tubes, increasing by lateral gemmation. Branches infre- 
quent, generally diverging at an angle of about 90°; diameter from 
3 to? mm. Cell tubes flexuose, sometimes flattened or subtriangular 
from mutual pressure. Some of the tubes attain a length of 14 mm. ; 
diameter from 0.75 to 1 mm. Exterior marked by transverse wrinkles 
