Silurian.) PALZONTOLOGY OF VICTORIA. [{ Graptolites. 
great beauty, and easily distinguish it from any other with which I 
am acquainted. For those writers who prefer to break up the 
genus Didymograpsus, the name Goniograptus might be suggested 
for such types as the present, in which the branches of the funicle 
(for which I would suggest the name stolons) are angularly bent 
at the points of budding into the celluliferous stems. 
Rare in the black and red slates of the Llandeilo flag age of the 
Bendigo goldfield, Sandhurst, Victoria. 
EXPLANATION OF FIGURES. 
Plate L.—Fig. 1, nearly perfect specimen, natural size. The cells appear sometimes on the 
right and sometimes on the left side, according to the accidental direction of the flattening on 
the plane of deposition of the stone. Those branches that appear without cells have the non- 
celluliferous back exposed, and the cells are probably imbedded ina plane at right angles to that 
in which the branches are spread. Fig 2, portion of another, larger specimen, natural size. 
Fig. 2a, portion of ditto, magnified to show the small conical central funicle and the primary 
branches of the stolon. Fig. 2, cells of ditto, magnified. Fig. 3, portion of very much larger 
specimen, natural size. Fig. 4, an allied form not sufficiently perfect for description, natural 
size. 
Prats L., Fie. 5. 
GRAPTOLITES (DIDYMOGRAPSUS) HEADI (Hatz). 
Description.—Central stype straight, about 1 line long, bifurcating at each 
end into two equal straight branches (four in all) several inches long, connected at 
base by a quadrate nearly square corneous disc, the four straight sides of which 
measure about 7 lines between the branches and 8 lines between the pairs. Cell 
denticles five in 3 lines, straight or slightly curved, making an angle of about 
85° with the back, exposed portion one-fourth the length of the cell, the diameter 
of the aperture and exposed outer side about equal and rather less than one-third the 
width from angle to back; when perfect, edge of aperture slightly convex, and the 
angle forming a thick downward arched hook. 
REFERENCE.—Geol. Surv. Can. Dec. 2, p. 94, t. 6, f. 8. 
The specimen figured is the only Graptolite which has yet oc- 
curred to me in Australia with the central corneous quadrate disc, 
such as Prof. Hall has made known in the G. Headi of Cambrian 
or Lower Silurian slates of Canada. The angle made by the cells 
with the axis is stated to be about 50° by Prof. Hall, but his figure 
more nearly agrees with our example. 
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