PLATE XXVIII. 



CARBONIFEROUS SPECIES. 



Fig. 



1 to 6. Strophomena analoga, Phillips. Different specimens from the Carbo- 



niferous limestone of Kildare, in 

 Ireland; Longnor, in Derbyshire; and 

 Corrieburn, Stirlingshire. 



7. ,, ,, var. distorta, Sow. Lanarkshire, Scotland. 



8. „ ,, „ A very young shell of the 



same. 



9. ,, „ Interior of the ventral valve, in which the foraminal 



aperture is cicatrized. 



10. „ „ Interior of the dorsal valve. 



11- ,, ,, Internal cast, seen from the front, showing the 



vascular impressions (enlarged). 



12. ,, ,, A fragment of the ventral valve, showing the 



position of the foraminal aperture. 



13. „ „ The same, seen from the exterior, showing the 



foramen. 



14. Orthis Keyserlingiana, Be Koninch .From the Carboniferous limestone 



of Settle, in Yorkshire. 



15. Orthis ? antiquata, PMllips. From the figures in the 'Geology of Yorkshire.' 



lb a,i ' c,d . Enlarged representations, drawn 

 from the original specimens, Bolland. 

 British Museum. 



