6—REPORTS ON GRAPTOL1TES. 
{By T. S. Hall , M.A.) 
A Revision of the Species from Eastern Victoria. 
As I have at present in my hands for examination the whole of the New 
South Wales graptolites in the collection of the Geological Survey of that 
State, I have taken the opportunity of critically comparing the specimens 
with those from eastern Victoria in the collection of the Department as 
well as with a few in my own cabinet. Exact comparison of horizons is as 
yet impossible, owing to the smallness of our collections and the imperfect 
nature of a good deal of the material, but a few alterations in the lists will 
be found. 
The descriptions of two new species are added, and a table showing the 
range of the species in Victoria as far as is at present known. 
' v ■ . \ ; l 
Didymograptus ovatus, n. sp. 
Fig. 1. 
Hydrosome stout, branches abruptly recurved and gradually approaching 
one another, so that the polypary resembles, in outline, an imperfect specimen 
of Phyllograptus typus. Branches of a uniform width 
of 1mm., or to the tip of the mucronate extensions of 
the thecae about 2mm. Sicula long and slender with 
a delicate virgula. Thecae curved, expanding, about 
0*5 mm. wide, overlapping by one-half their length, 
and at a distance of about 10mm. from the sicula in¬ 
clined at an angle of 40° ; outer margin curved ; 
apertural margin deeply concave, and produced so 
as to make, with the outer margin, a stout, spinose, 
mucronate extension of about 1mm. in length. Thecae 
numbering 12 in 10mm. 
The species is closely allied to D. cacluceus , Salter, 
but differs in the form of the aperture of the thecae as 
well as in the more abrupt reflection of the branches, 
which maintain a constant rate of curvature instead 
of becoming almost straight distally, as is the case in 
Salter's species. 
In the specimen figured a minute fault cuts across 
the earlier formed thecae, as shown in the figure, so 
that a correct idea of their form is not possible. The 
shape of the over-lapped portions of the thecae can 
only be made out where shown in the figure, though otherwise the specimen 
is in a very good state of preservation, the sicula and virgula being very 
clearly displayed. 
Locality and Horizon. —A single specimen from Sandy’s Creek, Mitchell 
River, where Hicranograptus ramosus and Glossograptus hermani are found 
in the same beds. Upper Ordovician. 
4541. 
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