86 CANADIAN FOSSILS. 
Puate VI. 
4, A frond in which three of the stipes, and the base of the fourth, are preserved. The 
specimen shows some peculiarity in the union of the parts by the slender 
funicle. 
Formation and Localities—Shales of the Quebec group ; Pomt Lévis, 
Grds Maule, and river St. Anne. 
12. GraptotitHus Bieaszyti, Hall. 
Plate XVI, figures 22-30. 
(PHYLLOGRAPTUS SIMILIS, Hall: Geological Survey of Canada, Report for 1857, page 140, 
Compare Didymograptus caduceus, Salter: Quarterly Journal of the Geol. Society, 
vol. ix, p. 87.) 
Description.—Frond broadly oval or sub-oval, consisting of four some- 
what semi-elliptical stipes, which are nearly straight or slightly curved on 
the non-celluliferous margin, and broadly curved on the celluliferous side ; 
all closely united at the base in a radicle (?), and from which they are 
abruptly recurved. These stipes are more frequently distinct at the 
apex, While in some individuals they are in contact or apparently 
united at that pomt, but always separated in the centre for a dis- 
tance of three fourths their length. Entire length of specimens from 
four to six tenths of an inch, and width three tenths of an inch, exclu- 
sive of the denticles. The individual stipes, in the centre of their length, 
are twelve hundredths of an inch wide. Radicle undetermined. Cellules 
from thirty-two to thirty-six in the space of an inch, narrow at the base, 
gradually ascending and curving outwards, except those near the base, 
which are recurved: cell-margins curved, and extended in mucronate points, 
which are the continuation of the cell-partitions. Test thin and smooth, 
with the exception of the cell-partitions. 
This species presents a great variety of aspects, and the most critical 
examination has left some doubt as to its original mode of growth. The 
more perfect specimens are broadly oval, the diameters about as three to 
four; and where the stipes are apparently conjoined, at the two extremi- 
ties, there is a vacant space in the centre (extending about three fourths of 
the length, and from six to eight hundredths of an inch in width), except 
that some portions of one or both the other stipes are visible. In one or 
two individuals, there is a linear body extending longitudinally through this 
space, which may have been originally the axis; but its relations cannot 
