164 PROCEEDINGS OF THE GEOLOGICAL SOCIETT. [Jan. 7, 



Kirkby has also recently found, in the Lower Permian limestone of 

 Hartley Quarry, Sunderland, a species of Chonetes, which I believe 

 will turn out to be identical with the Carboniferous C. Hardrensis. 

 It must also be remembered that M. de Verneuil has stated, in the 

 work on Russia, that Chonetes sarcinulata has been found to range 

 throughout the whole Silurian, Devonian, Carboniferous, and Per- 

 mian periods ; but it is probable that the Carboniferous and Permian 

 form is more properly referable to C. Hardrensis than to the Silurian 

 species (?) ; so that we may further estimate that out of the eighteen 

 or nineteen British Permian species, eleven are common to the two 

 periods. Now of the remaining seven. 



Terebratida elongata has often been considered to be Carboniferous 

 as well as Permian, but of the absolute identity of the two forms I 

 do not profess to feel quite certain. 



Sjririfera alata has not hitherto been positively recognized in rocks 

 older than the Permian ; but there are certain Devonian and Car- 

 boniferous Spirifers to which it is somewhat related. 



Camarophoria Hambletonensis, Howse, has not hitherto been found 

 except in Permian rocks. 



Streptorhynchus pelargonatus, Schloth., bears much resemblance 

 to certain varieties of Strept. crenistria, although probably specifically 

 distinct. 



Productus horridus and P. latirostratus are not known up to the 

 present time, except in Permian rocks ; but in their shape and cha- 

 racter they are not extremely distant from certain Carboniferous 

 forms. 



Strophahsia Goldfussi is still characteristic of the Permian period. 



This rapid examination of British Permian Brachiopoda will, I 

 trust, suffice to show that there exists not only a general close affinity 

 between the Permian and Carboniferous Brachiopoda, but also that 

 the majority of the species of the former period are identical with 

 some of the latter : and I may likewise mention, that although the 

 Permian rocks of Russia, Germany, Spitzbergen, and other places 

 present us with a few distinct forms, even some of these recall to 

 mind certain Carboniferous species ; nevertheless I dare not pro- 

 nounce them identical ; and it will require much further examina- 

 tion before they can be considered entirely distinct. 



The Gasteropoda and Conchifera that occur in the Permian 

 rocks are few in number, and have not yet been carefully compared 

 with those of the Carboniferous period. Mr. Howse has informed 

 me that the Anthracosia aquilina, Sow., sp., found by him in the 

 Lower New Red of Tynemouth, is the same as that which occurs in 

 the Coal-formation of England. Mr. Rupert Jones has also recently 

 been able to add another link between the two formations in Estheria 

 tenelJa, which is common to the Permian and Carboniferous rocks of 

 Germany. M. de Verneuil observes, in his excellent paper pub- 

 lished in the ' Bulletin de la Soc. Geol. de Prance,' 2 ms ser. vol. xix.. 

 that, among the Pteropoda, there exist a species of Theca and one of 

 Conidaria so nearly related to certain Devonian (Carboniferous?) 

 forms of the same genera, that it requires great attention to be able 



