340 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 
Conodonts are to be ascribed to the Vertebrate or Invertebrate 
sub-kingdoms. If they belonged to any division of the Inverte- 
brata their size, form, and appearance would point towards the 
Mollusca, but the dental apparatus of existing forms of this 
division is siliceous, whereas the Conodonts are calcareous in 
their chemical composition. Besides, no Gasteropoda of sufficient 
size to have had lingual teeth of the dimensions of the Conodonts 
are found in the same beds with them, and it does not appear 
likely that naked forms of Mollusca would exist in any numbers 
without being accompanied by shell-bearing forms. It is 
interesting to note, however, that in these Ayrshire Carboniferous 
strata, as well as in America and Russia, the Conodonts are 
found associated with numerous undoubted fish teeth and scales 
of fishes. Some of these from the Ayrshire deposits are scarcely 
larger than the Conodonts, but their appearance readily allows 
them to be separated. 
I append short descriptions of the various forms, and refer to 
the localities where those already described have been previously 
found. To avoid repetition of the references, I may here men- 
tion that the Russian Conodonts were described by Dr. Pander in 
his “Monographie der fossilen Fische des Silurichen Systems 
der Russischen—Baltischen Governments,” St Petersburg, 1856. 
The Conodonts from the Carboniferous of Ohio are described and 
figured by Dr. Newberry in the 2nd volume of the “ Paleontology 
of Ohio;” and those from the Silurian and Devonian of North 
America by myself in the Quarterly Journal of the Geological 
’ Society for 1879. 
[For easy reference I may here give the stratigraphical position 
of the various localities in which I have found Conodonts in the 
Carboniferous limestone strata of the West of Scotland. 
Stacklawhill, Stewarton. 
Glencart, Dalry. Upper 
Monkcastle, Dalry. Limestones. 
Linn Spout, Dalry. 
Orchard, near Thornliebank. 
Robroyston, near Glasgow. Middle 
Limekilns, East Kilbride. Limestones. 
Hillhead, Chryston. 

