GRAPTOLITES OF VICTORIA. 
Elongation of the funicle is accompanied by slight flexing 
of the branches (text figs. 3c-3g) ; subvertical compression and 
turning over of the sicula and funicle, by strong flexing and 
distortion (text figs. 3 a, 3 b). 
If the polypary came to rest on the apex of the sicula and 
the distal ends of two branches, all four branches would be 
compressed on one side of the funicle ; this has been observed 
in T. decipiens. 
T. decipiens var. bipatens differs from T. decipiens, see 
T. S. Hall (7), in the following respects : — 
T. decipiens var. bipatens. T. decipiens. 
Branches of second order. 
Widen rapidly to 0.8 mm. 
and maintain that width 
throughout 
Widen from 0.6 mm. 
rapidly to 1.5 mm. 
Thecae — 
Number in 10 mm. 
8 or 10 
9 or 11 
Length to width 
3 : 1 
4 : 6 
Angle of inclination 
O 
O 
27° 
Overlap 
1 
4 
i 
Associated graptolites. — Clonograptus cf. rigidus J. Hall, Bryograptus spp., 
Tetragraptus approximatus Nicholson, T. acclinans Keble, T. decipiens T. S. Hall, 
T. fruticosus (J. Hall), Didymograptus aureus T. S. Hall, D. latens T. S. Hall, 
D. latus T. S. Hall, Loganograptus logani J. Hall, etc. 
Horizon. — Lower Ordovician, Bendigo Series, Zone B5 ; probably also 
Lancefield Series, Zone LI. 
Locality. — Antimony Mine, Lerderderg River, one mile downstream from 
Blackwood. 
Genus PTEROGRAPTUS Holm 1881. 
Pterograptus lyricus, sp. nov. 
(Plate XX, fig. 4 and text fig. 4.) 
Polypary consisting of (a) two outer monopodial branches widening from 
0.2 mm. near sicula to 0.5 mm. in distal portion, approximately straight for 
at least 1.2 cm. and lying within an angle of 65°, then curving gracefully for 
rest of length (3.5 cm.), first away from, then towards, axis of polypary, the 
curve increasing at distal extremity until ultimately trending at right angles 
to axis ; (b) forty or more inner branches of like dimensions arising from 
consecutive monopodial thecae, forming at point of origin an acute angle with 
branch of first order, those arising near sicula being slightly curved, curvature 
increasing with remoteness of branch, the most distal curving gracefully 
upwards and inwards and converging like outer branches towards axis of 
polypary. Sicula 0.5 mm. long. Thecae long, narrow, simple tubes ; in 
proximal portion 10 or 11 in 10 mm. ; about four times as long as wide, over- 
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