267 
From Turquoise Mine , Mount Avis, Edi. 
(Nos. 344-365. Collected bv Mr. A. M. Howitt.) 
Nos. 344, 345, 347, and 350 are, I think, branches of iai member of the 
family Dicliograptidce , perhaps Didymograptus. They do not, I think, 
belong to the family generally known as Leptograptidce , nor to the Mono- 
graptidce. They are, however, extremely indistinct. Nos. 346, 353, 356, 
358, 360, 361, and 362 are indistinct Diplograptidce of indeterminate char¬ 
acter; while Nos. 348, 351, 354, 363, and 365 are referable to Diplograptus 
itself, and 349. 355, 357,.. and 364 are Climacograpti. A second specimen 
on No. 351 is a Glossograptus. I doubt if No. 359 is organic. 
In no case can specific determinations be suggested. If the generic 
determinations of Didymograptus and Glossograptus be correct, and they 
seem to be, then the age of the beds may be put down as Upper Ordovician. 
From Graptolite Gully, Jordan River, Aberfeldy District. On track, half- 
a-mile from the Thomson River junction. 
(Nos. 366-382. Collected by Mr. William Baragwanath, jun.) 
Monograptus seems to be the only genus represented, and, as far as the 
material allows of careful examination, only one species is present. With 
some hesitation, owing to the imperfection of the material, I identify this as 
M. dubius, Suess. The following description is drawn up from the specimen 
figuredi—Fig. 3 : — 
n 
Fig. 3 . 
Monograptus dubius, 
Suess. 
Nat. size. 
Monograptus dubius , Suess. 
(compare Wood 1 , E.M.R. in Quart. Jour. Geol. 
Soc. vol. 56, 1900, p. 454). 
Length of figured specimen 29 mm., breadth at 
2' mm. from sicular end 2.3 mm. The hydrosome 
broadens till about the region of the tenth theca, 
after which the breadth remains almost constant. 
The back is at first straight and about the level 
of the third theca becomes slightly concave, then 
convex, and finally runs on in the same direction 
as at first. This “ monoclinal fold,” though 
slight, is characteristic of the species. Thecae 
9 in. 1 cm., inclined at 25 deg. to 30 deg., and 
with a hooked denticle. There seems to be a 
slight difference between the younger and older 
thecae, but the specimens are not satisfactory 
on this point. 
The species in Europe has a long range, and 
probably has so here, but the age of the con¬ 
taining beds is certainly Silurian. 
•University, Melbourne, July 5, 1904. 
