GRAPTOLITES OF VICTORIA. 
differs from Elies and Wood’s form in having thecae more 
closely set, in its smaller maximum width and wider proximal 
portion ; from Ruedemann’s form in having a smaller angle 
of the thecae and a persistent basal spine. Though Ruedemann 
does not illustrate the proximal thecae and no definite con- 
clusion can be based on his figure, the differences between his 
form and ours appear to be of varietal importance only. 
Associated, graptolites . — As with D. ( G .) euglyphus. 
Horizon . — Lower Ordovician, Darriwil Series, Zone D1 ; Upper Ordovician, 
Gisbornian Series. 
Localities . — The same as those of D. ( G .) euglyphus. 
Subgenus Amplexograptus Elies and Wood 1907. 
Diplograptus ( Amplexograptus ) cf. perexcavatus Lap worth. 
Diplograptus perexcavatus, Lapworth, Cat. West. Scott. Foss., II, 1876. 
p. 6, pi. ii. 
Diplograptus ( Amplexograptus ) perexcavatus, Elies and Wood, Mon. Brit, 
Grapt., pt. vi, p. 267, Pal. Soc., lxi, 1907, pi. xxxi. 
(Plate XXI, fig. 3.) 
A few specimens of D. ( A .) cf. perexcavatus have been 
collected at Bendigo East and Sunbury. All are distorted or frag- 
mentary, particularly in the proximal portion, and all specific 
criteria cannot be checked. The largest fragment is 11.0 mm. 
long and has a maximum breadth of 2.0 mm. at the distal 
extremity. Thecae from 12 to 14 in 10 mm., preserved in both 
scalariform and subscalariform aspects. In scalariform ( Climaco - 
graptus) aspect, the excavations are deep, occupying one-half 
the breadth of the polypary ; in subscalariform aspect, the 
ventral margins of thecae have a double curvature, but less 
pronounced than that of some British forms. 
Associated graptolites. — Diplograptus coelatus Lapworth. 
Horizon. — Lower Ordovician, Darriwil Series, Zone D1 ; Upper Ordovician, 
Gisbornian Series. 
Localities. — Small washout east of Sunbury-Gisborne Road, about 2 miles 
N.W. of Sunbury ; Bendigo East. 
Genus TRIGONOGRAPTUS Nicholson 1869. 
Trigonograptus sp. 
(Plate XXI, figs. 4 a, 4 b.) 
Polypary about 2 cm. long, at proximal end approximately 1 mm. wide, 
widening to 3.1 mm. in 1 cm. and then narrowing to a pointed distal extremity. 
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