PLATE XL 



(Carboniferous Species.) 



1 — 2. Spirifera glabra, Martin. Very large specimen. From the Wensleydale 



district, in the collection of Mr. E. Wood. 



3. — — From Millecent, Ireland. 



4, 5. — — Young shells. From BoUand. 



6. — — var. symmetrica, Phillips. 



7. — — From Hill-head, Carluke parish, Lanarkshire, Scotland. 



8. — — = var. oblata, Sow. From the original specimen in the 



collection of Mr. J. de C. Sowerby. 



9. — — Fragment, showing the dimensions of the spiral appendages. 



From the original specimen represented under another 

 aspect in the ' Min. Con.,' tab. 268, fig. 1. 

 10. — lineata, Martin = Sp. mesoloha, Phillips. This illustration is copied 



from pi. X, fig. 14, in the 'Geol. of Yorkshire.' 



