200 Prof. M‘Coy on the Recent Zoology 
whole of the planes of deposition in millions, to the exclusion of 
everything else, exactly as it does in certain ‘beds of the English 
Caradoc Sandstone near Church Stretton. In some localities 
these are replaced by great numbers of the Bohemian Diplo- 
grapsus palmeus (Barrande), on the upper end of many specimens 
of which I find a large, smooth, pear-shaped or heart-shaped 
appendage which I believe to be an ovarian vesicle. I should 
remark that I have observed exactly the same appendage (bear- 
ing out, I think, the idea, which I have supported formerly on 
other grounds*, of the affinity of the Graptolites with the-Hy- 
droida) in specimens of this species from the slates of the typical 
locality in Bohemia, when carrying out the direct careful com- 
parisons of specimens of species which I state to be identical in 
Victoria and other countries ; so the frequent observation of this 
apparent ovicell in the Victorian specimens does not at all affect 
the identity of this species with that of the basin of Bohemia, of 
which there can be no doubt. The D. ramosus (Hall) in our 
slates is also identical with those of the Utica Slate of New York. 
Of the group of compound Canadian Graptolites, the commonest 
in the Victorian gold-field slates of many localities is the Didy- 
mograpsus caduceus (Salt.), first described from the Quebec Slates. 
In many localities the specimens of this species are as small as 
the first-described Canadian ones; but in others they acquire a 
greatly increased size, occasionally twice the length and nearly 
three times the width; and the angle of divarication of the two 
branches varies from 5° to 70°. This is usually accompanied 
by the D. serratulus (Hall), identical with those of the New York 
Slates, and generally also by the very large Canadian D. bryonoides 
(Hall), which it is possible may be hereafter found to be the 
perfect development of my G. datus. The D. nitidus (Hall) is 
more rare, but perfectly identical with the Canadian types. The 
Graptolites gracilis (Hall), identical with the New-York and 
Canadian species, is one of the rarer compound forms, The 
curious radiating compound forms, which created so much 
astonishment when published first by Professor Hall in his De- 
cades of the paleontology of this part of Sir H. Logan’s Geo- 
logical Survey of Canada, | find in just as great abundance in 
the slates of the same age in Victoria. D. octobrachiatus, D.. 
quadribrachiatus, and D. Logani (Hall) are, especially the latter, 
not uncommon in many of the gold-field localities. The curious 
Canadian quadrifid Graptolite, named Phyllograpius typus by 
Hall, is one of our most abundant Australian Graptolites; but, 
although sometimes upwards of an inch in length, small speci- 
mens, I find, on comparison with Swedish specimens of the 
G. folium of Hisinger, are perfectly identical therewith; and, 
* British Paleeozoic Rocks and Fossils. 
