PLATE XL1X. 



CARBONIFEROUS SPECIES. 



Pro. 



1. Lingula squamiformis, Phillips. The original specimen. Bolland; Gilbert- 



sonian collection, British Museum. 



2. ,, „ From Carboniferous shales, near Glasgow. Museum of 



Practical Geology. 



3. 4, 5. „ ,, Prom near Carluke and Lesmahago, Lanarkshire. 



6. ,, ,, In Carboniferous shales. This fine bivalve specimen 



was found by Mr. Rodwell at about a mile to the east 

 of Bally Castle, on the north coast of Antrim, in 

 Ireland. 



7. ,, ,, A portion of the shell enlarged, to show its sculpture. 



8. „ ,, Large, crushed, specimens, from an ironstone bed one 



mile north of Glasgow. 



9. „ ,, m. Interior of the ventral valve, n. An internal cast of 



the dorsal one, from 341 fathoms below " Ell Coal," 

 in the parish of Carluke, Lanarkshire. 



10. „ ,, Interior of the ventral valve, from Lemmington, Northum- 



berland, collection of Mr. Tate. 



{Supplemen tary illustrations.) 



11. Tercbr alula hast at a. A very large, full-grown specimen. This shell is labelled 



" Bolland" in Dr. Bowerbank's collection. 



12. „ ,, With colour-markings. Settle, Yorkshire. 



13 — 16. ,, „ These figures are taken from specimens distorted by 



pressure or cleavage, to show what extraordinary modi- 

 fications a same species may assume in fossilization 

 under peculiar circumstances. Prom the Carboniferous 

 limestone of Cork, in Ireland. 



17. „ ,, Interior, showing the loop. Settle, Yorkshire. 



18 — 20. ,, ,, Var. Gitlinyensis, Dav. 



21 — 20. „ ,, Passage forms connecting T. hastata with T. vesicularis. 



Prom the Carboniferous limestone of Bowertrapping, 

 three miles south of Dairy, in Scotland. Pig. 26 

 in the collection of Mr. R. Galloway, of Paisley. 



27 — 30. „ ,, Passage shapes between T. sacculus and T. vesicularis. 



Prom Settle and Gilling, in Yorkshire. 



