200 Prof. M'Coy oji the Recent Zoologij 



whole of the planes of deposition in millions, to the exclusion of 

 everythnig 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- 

 yrapsus palmeus (Barrande), on the upper end of many specimens 

 of which 1 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, 1 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 1 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 

 M'hich 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- 

 moyrapsus caduceus (Salt.), first described from the Quebec Slates. 

 In many localities the specimens of this species are as small a. 

 the first-described Canadian ones ; but in others they acquire • 

 greatly increased size, occasionally twice the length and nearb 

 three times the width ; and the angle of divarication of the twc 

 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/), hryonoides 

 (Hall), which it is possible may be hereafter found to be the 

 perfect development of my G. latus. 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 paheontology of this part of Su* H. Logan's Geo- 

 logical Survey of Canada, 1 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 Plujllograptus 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 Palaeozoic Rocks and Fossils. 



