GRAPTOLITES OF AUSTRALIA 
73 
this form are now included by Harris and Thomas in the 
Bolindian. Thomas and Keble (126) stated that this form 
occurred at the top of the Eastonian as well as at the base 
of the Bolindian. Harris and Thomas consider that the 
association of forms allies these beds more to the Eastonian 
than to the upper part of the Bolindian. Lithological changes 
appear in the Bolindian, so that in all probability it may be 
necessary to transfer this zone to the Eastonian, thus 
increasing the similarity with the British succession. 
The higher beds of the Bolindian are included in the zone 
of Dicellograptus cf. complanatus. Three assemblages 
deserve mention in this zone: 
(a) beds with the form identified as D. cf. coynplanatus; 
(b) beds with Retiograptus pulcherrimus, Leptograptus 
eastonensis and Climacograptus uncinatus; 
(c) beds with Glgptograptus tamarisciis. 
The exact relationship is imperfectly known, but no Dicrano- 
graptus has yet been found in these beds. 
Harris and Thomas add a correlation of Victorian Ordo- 
vician zones with those of Great Britain, North America, 
Sweden, Norway, Bohemia, China and South America. They 
also include three plates of line drawings of the more 
important graptolites. 
O. M. B. Buhnan (158) comments on several graptolite 
genera that are found in Australia. Goniogrciptus with its 
four main zig-zag stipes (second order of dichotomy) from 
the angles of which undivided lateral branches are given oft 
alternatively on both sides (the lateral branching being very 
regular both as regards interval and angle) might equally be 
considered as resulting from a regularly alternating dichoto- 
mous type of division. Bracliiograptus has four main stipes, 
which form with the “funicle” the letter H, from the outer 
sides of which undivided lateral branches are produced. He 
comments on Atopogmptus under the heading of Didymo- 
graptiis. Oncograptus he considers is apparently derived 
from Tetragmptus by stipe reduction, but retains the two 
branches incorporated in the proximal end. Cardiograptus, 
in which the distal stipes have failed to develop, resembles 
Oncograptus. 
He doubts the occurrence of Biplograptus (sensn, strict o, 
i.e., Mesograptus) and Amplexograptus in Australia. He 
queries frigonograptus as a member of the Diplograptidae. 
Skiagraptus is also queried as a member of the Diplograp- 
tidae, and he briefly defines it as having “biserial proximal 
