1863.] DAVIDSON NOVA-SCOTIA^ BKACBTIOPODA. 163 



chus carhonarius, Murch., has been found in the "New Red" of 

 Tynemouth, as well as in the Coal-formation. 



Mr. J. Kirkby has also recognized the Bryozoon, Fenestella plebeia, 

 M'Coy, as common to both periods in England ; and, although Mr. 

 Salter seems to doubt the identification of the Carboniferous form 

 above named, it is quite evident that the Fenestella discovered by 

 Mr. Kirkby in our Permian deposits is also represented by the same 

 species in the Carboniferous strata of this country. 



Among the Pisces, Gyracanthus tuberculatus, Ag. (G. formosits, 

 Howse, Cat. Perm. Eoss., non Ag.), has been stated by Mr. E. Howse 

 to be common to the Lower New Red and the Coal-measures of Eng- 

 land, and he considers that a species of Holoptychius ? has been found 

 in the Rothliegende and the Coal-measures of Germany. 



It has been very justly observed that, with the Plants, the Bracliio- 

 poda have, up to the present time, received the greatest attention ; and 

 it has appeared to Mr. Kirkby and myself, after a minute and length- 

 ened examination, that, out of the eighteen or nineteen species of 

 British Permian Bracliiopoda hitherto discovered, half at least, or 

 50 per cent., are common to the Permian and Carboniferous periods ; 

 and in support of this statement I must refer the reader to pages 

 266-270 and 279-280, and Plates 54 and 55 of my Monograph of 

 Carboniferous Bracliiopoda, in addition to Mr. Kirkby's paper already 

 mentioned. 



To the following list 1 have added, between brackets, the names of 

 those palaeontologists who have acknowledged the recurrence : — 



1. Terebratula sacculus, Martin, 1809, C. == T. sufflata, Schloth., 1816, P. 



(King, De Verneuil, Kirkby, Davidson, Salter.) 



2. Athyris Koyssii, BEveille, 1835, C. = A. pectinifera, Sow., 1840, P. (De Ver- 



neuil, Kirkby, Davidson.) 



3. Spirifera Urii, Flem., 1828, C. = Martinia Clannyana, King, 1848, P. (David- 



son, Kirkby, De Verneuil, Salter.) 



4. Spiriferina octoplicata, Sow., 1827, C. = Sp. cristata, Schloth., 1816, P. (De 



Verneuil, Davidson, Kirkby, Salter.) 



5. Camarophoria crumena, Martin, 1809, C. = T. Schlotheimi, Buch, 1834, P^ 



(Morris, Davidson, Kirkby, King, De Verneuil, Salter.) 

 G. Camarophoria globulina, Phil., 1834, P. = T. rhomboidea, Phil, 1836, C. 

 (Davidson, Kirkby.) 



7. Discina nitida, Sow., 1812, C. = D. Koninckii, Geinitz, 1848, P. (Davidson, 



Kirkby.) 



8. Lingula mytiloides, Sow., 1812, C. = L. Credneri, Geinitz, 1848, P. (Kirkby, 



Davidson.) 



It may be further observed, that it is hardly possible to distin- 

 guish the Permian Crania Kirkby i, Dav., from the Carboniferous 

 Crania quadrata, M'Coy ; and it is almost certain that Spiriferina 

 multiplicata, King, occurs likewise in our Carboniferous strata. 

 Stroplialosia Morrisiana, so characteristic of the Permian period in 

 Europe, has been found by Mr. Purdon (and described by myself in 

 this Journal*) in the Carboniferous limestone of the Punjaub, as 

 well as another larger species, which closely resembles the Russian 

 Aulosteges Wangenlieimi, Vern. (A. variabilis, Helmersen). Mr, 



* Quart. Journ. Geol. Soc. vol. xviii. p. 32. 



m2 



