CARBONIFEROUS BRACHIOPODA. 
313 
45. Chonetes laguessiana, var. gihberula, M'Coy. Dav., Garb. Mon., p. 188, PI. 
XLVII, figs. 23 ; and Sup., 
PI. XXXIV fig. 19, 20. 
This small variety of C. Laguessiana has been found by Mr. J. Neilson in a rotted 
limestone occurring in the upper beds of the Lower Limestone series at Dockra Quarry, 
near Beith, in Ayrshire. It is there associated with twelve or thirteen minute forms of 
Brachiopoda. The specimens of this small variety of Chonetes do not appear to have 
quite attained in this locality two lines in length, by the same in breadth. Mr. John 
Young has also found a well-preserved specimen of the same shell in the Carboniferous 
Limestone of Corrieburn Campsie, near Glasgow. 
In a paper " Further Remarks on Adherent Carboniferous Productidse " (' Quarterly 
Journal of Geol. Soc.,' vol. xxxiv, p. 501, 1878), Mr. R. Etheridge, jun., figures and 
describes what he considers to be a Chonetes, adhering to a Produdus spine by 
a portion of the visceral region of its shell, and three of the hinge-spines. The shell was 
obtained from the Carboniferous Limestone of Scremerston Quarry, Northumberland. 
Since Productus, Aulosteges, and Strojjhalosia were able to attach themselves to foreign 
bodies by some of their spines, it is highly probable that Chonetes did occasionally enjoy 
the same privilege. 
