from the Upper Silurian i Wenlock Limestone ' of Dudley. 95 



16. Chiton ? cordatus, Kirkby. Durham. 



17. Chitonellus Ilancockianus, Kirkby. Durham. 



18. distortus, Kirkby. Durham. 



19. antiquus, Howse, sp. Durham. 



Carboniferous Limestone. 



20. Chiton concentricus, De Kon. Vise. 

 f gemmatus *, De Kon. Vise. 



i , var. mosensis, De Ryckh. 



21. < , Viseticola, De Ryckh. 



' , legiacus, De Ryckh. 



t , eburonicus, De Ryckh. 



22. Chiton priscus, Munster. Tournay. 



23. nervicanus, De Ryckh. Tournay. 



24. turnacianus, De Ryckh. Tournay. 



25. Mempiscus, De Ryckh. Tournay. 



26. ■ (Chitonellus), cordifer, De Kon. Tournay. 



27. thomondiensis 1% Rally. County of Limerick. 



28. Burrowianus %, Kirkby. Settle, Yorkshire. 



And probably three or four other species from that locality. 



Upper Devonian. 



29. Chiton laevigatas, Fr. Ad. Roemer. Grund. 



30. tumidus, De Kon. Grund. 



Middle Devonian. 

 f Chiton corrugatus, G. fy F. Sandberger. Villmar. 



m J cordiformis, G. Sandberger. 



' *) priscus, G. Sandberger ; non Munster. 



L Sandbergianus, De Ryckh. 



32. Chiton sagittalis, G. 8f F. Sandberger. Villmar. 

 , n. sp. Plymouth (Geol. Surv. Collection). 



the genus Chitonellus ; the one he calls Chitonellus antiquus, having pre- 

 viously been mistaken by Mr. Howse for a Calyptrcea, was named by him 

 Calyptrcea antiqua. — W. H. B. 



* M. A. d'Orbigny, in his ' Prodrome de Paleontologie/ t. i. p. 127, 

 has proposed to change this name into that of subgemmatus, uuder the 

 idea that there already exists a Chiton of that name, described in 1825 by 

 M. De Blainville. This, however, is an error. — L. De K. 



t In April 1859 I made known, in a paper read before the Geological 

 Society of Dublin, the discovery of the plates of a Chiton of larger dimen- 

 sions than any previously met with (plates belonging to several indivi- 

 duals were obtained), from the Carboniferous Limestone of Lisbane ; since 

 then I myself collected other plates of a similar species in a cutting at 

 Hathkeale, on the Limerick and Foynes Railway. This species I described 

 by the above name of Chiton thomondiensis (vide Journ. of the Geol. 

 Soc. Dublin, vol. viii. pt. 2. p, 167).— W. H. B. 



X In a note to Mr. Kirkby's paper (Journ. of the Geol. Soc. of London, 

 vol. xv. p. 610), and a further communication with which I was favoured 

 by him, he mentions the fact of an additional discovery by Mr. J. H. Bur- 

 row, of an interesting series of plates of Chitons from the Carboniferous 

 or Lower Scar Limestone of Settle in Yorkshire. These plates he believes 

 to belong to five species, which he could not identify with any of the 

 Belgian species described by Baron Ryckholt and Professor De Koninck ; 

 one of them he has named Chiton Burrowianus, after the discoverer. — 

 W. H. B. 



