278 
Retiolites, sp. 
Plate xxxiv., Fig. 12. 
Two, or perhaps three or four, specimens of a species of Retiolites 
are present in close contact on one slab. A prolonged virgula is visible 
as in R. caudatus , T. S. Hall, but the hydrosome seems too narrow 
for that species, though its affinities are clearly with it. 
This is the best collection that has been submitted to me by fhe 
J 
Department alike in number of specimens and species, and in the state of 
their preservation. 
The beds are of Upper Ordovician age, and judging by the species 
occurring in Britain as well, are more closely allied to the Lower Hartfell 
series of that country than to any other. Closer comparison is not 
I think yet possible, and the relationships to the beds in the neighbourhood' 
of Mt. Easton must be worked out in the field. The fairly large number 
of species in the collection enables us to- fix a definite horizon, and 
upon this further work may be based. 
University, Melbourne, Sept. 28, 1905. 
Pilate xxxiv. 
Explanation of Figures. 
1. Leptograptus flaccidus (J. Hail). [712]. 
2. Dicellograptus elegans (Carruthers). [713]- 
3. Dicellograptus complanatus , Lap. var. ornatus , Elies ,and Wood. 
[ 686 ]. 
4. Dicranograptus ramosus (J. Hall), var. semispinifer , var. nov. 
[706]. 
5. Climacograptus mensoris , n. sp. [674]. 
6. Climacograptus baragwanathi, n. sp. [723]. 
7. Diplograptus ingens , n. sp. [741]. 
8 . Climacograptus bicornis (J. Hall). [785]. 
9. Glossograptus, sp. [766]. 
10. Diplograptus {Orthograptus) quadrimucronatus (J. Hall). [706]. 
* *" 55 >> j? [75^]* 
12. Retiolites , sp. [733]. 
13. Diplograptus carnei , T. S. Hall. [679]. 
The figures are all natural size. The numbers in brackets are those 
attached to the specimens figured, in the collection of the Department 
of Mines. 
By Authority : J. Kemp, Acting (iovernment Printer, Melbourne. 
