72 
VINE: NOTES ON YOREDALE POLYZOA. 
Seventy -seven species range through the three lower horizons of the 
Carboniferous series ; seventy-four belonging to the true Carbon- 
iferous Limestone, twenty-eight to the lower Limestone shales, and 
four to the Calciferous series ; not a single species passes to or occurs 
in the Yoredale, Millstone Grit, or either one of the three divisions 
of the coal measures. The whole group essentially belongs to and 
cha/racterises the Calcareous rocks and shales a,t the base of the 
formation^* 
If this be true, then, Palaiontologically speaking, we have no 
Yoredale rocks, for not only Polyzoa but many other organisms as 
well, are quite common to the Calcareous, and to the Yoredale series. 
It will, however, be far more advantageous to. science to keep the 
horizons of fossils distinct, than to lump the whole of the divisions 
as members of the Calcareous divisions only, irrespective of local 
changes. 
1 have already worked out the Polyzoa of Northumberland,! 
some of the rocks of which are of Yoredale age, whilst other rocks 
in the same district belong' to the Lower Limestone series ; and Mr. 
John Young of the Hunterian Museum of Glasgow, and the members 
of the Scotch Geological Survey, have furnished fair, if not complete 
lists of Upper and Lower Carboniferous forms, and it is to be hoped, 
that before long we shall have from the pen of Mr, G. W. Shrubsole 
complete lists of North Wales Carboniferous Polyzoa. Lists of 
American species are not completed. In the following table of the 
more generally known forms, only described species are noted. 
Explanation of the Table. 
I. Gleaston Castle — Yoredale Rocks — Near Barrow, W, Lancashire. 
2 Little Urswich „ ,, „ Dalton, ,, 
3. Loc. ? „ „ „ Loo. ? 
4. Holker Park • „ „ ,, Cark „ 
5. Hurst „ Yorkshire. 
G. Various Localities ,, „ Northumberland. 
7. Various Localities — Scar Limestone — Derbyshire and Lancashire. 
Indicated by D. & L. 
8. Various Localities — Lower Limestone Shales — Scotland. 
9. Various Localities — Upper Limestone Shales — Scotland. 
10. Vai'ious Localities — Carboniferous Limestone Shales — America. 
♦Presidential Address, Quart. Jour. Geol. Soc, Feb., 1881, p. 185. 
t "Naturlist," 1884 and 1885. 
