NATURAL HISTORY SOCIETY OF GLASGOW. 89 



Locality and Horizon. — Law Quarry, near Dairy, Ayrshire ; Main 

 or Hurlet Limestone, Lower Carboniferous Limestone group. 



Collections. — Messrs. J. Bennie, J. Armstrong, J. Smith, and 

 others. 



Chiton Loftusianus, King. (?) 



C. Loftusianus, King, " Catalogue Organic Remains, Permian 



Rocks;' 1848, p. 12. 

 „ ,, Kirkby and Young, Geol. Mag., 1867, iv., p. 340, 



t. 16, f. 17. 



Obs. — Through the kindness of Mr. Bennie I have been able to 

 examine the intermediate plate of Carboniferous age, noticed under 

 this name by Messrs Kirkby and Young. 



In the explanation of the plate attached to the above paper by 

 these authors, the specimen is said to have come from Settle. In 

 a recent letter, however, Mr. Bennie remarks, " Settle must be a 

 mistake, as in the copy of the paper sent me by Mr. Young, Settle 

 is scored out and AYilliamwood written instead, which must have 

 been done by Mr. Young himself, or by his direction." It appears 

 from this that the Carboniferous form of C. Loftusianus must also 

 be regarded as a Scotch fossil. 



When compared with the intermediate plate of our Chiton 

 IJalriensis, the plate of C. Loftusianus is visibly less arcuate ; 

 broader in relation to its transverse length ; the apex somewhat 

 more produced, and placed further posteriorly ; the hind margin 

 more or less oblique, instead of concavely sub-parallel to the front 

 margin, as in the Law Quarry form. Finally, the diagonal lines are 

 very strongly marked in C Loftusianus, but not so in the other form ; 

 the lines of growth strong, in the latter faint ; and square instead 

 of rounded. 



Locality and Horizon. — AYilliamwood, near Glasgow ; in shales 

 of the Orchard limestone, Upper Carboniferous Limestone group. 

 Collection. — J. Bennie. 



Chiton Ariustrongianus, sp. nov. — (PI. L, fig. 15.) 



Chiton, sp. Kirkby and Young, Geol. Mag., 1867, iv., p. 341, t. 16, 



f. 7 a-c. 

 Sp. Char. — Posterior plate shield-shaped, truncated and arched 

 in front, slightly attenuated behind and gradually sloping downwards. 

 Central line carinate, carina extending for about half the length of 



