and Palaeontology of Victoria. 201 



further, on carefully comparing Bohemian specimens of the G. 

 ovatus of Barrande with the Swedish G. folium, I have no doubt 

 they belong to one variable species, and are identical with the 

 smaller examples of the Australian and Canadian species, and, 

 further, that the European specimens are truly quadrifoliate, 

 like Hall's Phyllograptus ; and in this way the difference in the 

 different descriptions, as to the width of the midrib, becomes 

 intelligible. 



As a general rule, the Graptolite-slates in every part of the 

 world contain no other fossils. I many years ago discovered in 

 Wales, near Builth, the only shell I ever heard of in Graptolite- 

 slates (the Siphonotreta micula, M'Coy); and I was greatly sur- 

 prised to recognize it also in Victoria, in the Deep Creek section. 

 The Crustacean genus Hymenocaris is represented by a new 

 species, H. Salteri (M^Coy), found in most of the Graptolite- 

 slate localities. 



In a different set of sandy, marly, and mud-stone beds (as at 

 Woori Yallock,Yarra) we find : — an extensive series of the genera 

 and many of the species of Corals, Trilobites, and Mollusca of 

 the '^Bala beds" of North Wales; species of Favosites^, Palceo- 

 'ora, Calymene, Phacops, Beyrichia, Strophomena, Leptagonia 

 lepressa, Spirife. a reticularis, Orthis elegantula, the characteristic 

 ,ittle genus CuculleUa, Murchisonia, Conularia, &c. ; and some 

 species new, and some identical with British ones, forming a 

 group so completely reproducing the well-known Bala beds as 

 to afford a second case in support of the view of the general 

 specific ideutity of the marine fauna over both hemispheres of 

 the whole world in the earliest palseozoic times. 



It is curious that I have not yet seen any trace of the genus 

 Trinucleus in Australian beds, nor Amjnjx, while all the above- 

 mentioned genera of Trilobites, with Acidaspis, Chirurus, &c., 

 are well marked. 



I can scarcely close this part of the subject without drawing- 

 attention to the curious confirmation offered in Victorian geo- 

 logy of the view of Professor Sedgwick and myself, that there 

 was a real systematic line of division between the Upper Silu- 

 rian and the Cambrian and Lower Silurian, at the base of the 

 Mayhill Sandstone and over the Caradoc Sandstone — the May- 

 hill Sandstone, which we first defined and demonstrated to have 

 Upper-Silurian fossils only, and the true Caradoc Sandstone full 

 exclusively of Lower- Silurian or Cambrian types, — the previous 

 confusion of these two sandstones, from the erroneous mingling 



* It is vvoithy of remark that as on the continent of Europe the Devonian 

 genus Pletirodictyum has now been found in Sihirian strata, so in those 

 beds in Victoria I find a new species (P. megastoma, M'Coy), with cells 

 half an inch in diameter. 



Ann. ^ Mag. N. Hist. Ser. 3. Vol. xx. 14 



