PERMIAN FOSSILS FROM DURHAM. 293 



found fragments of different individuals belonging to only one 

 species. 



In addition to the above, it may also be mentioned that a 

 minute fossil, resembling a claw, or a portion of some forceps-like 

 instrument, has also occurred, which very probably belongs to 

 some of the anterior extremities of this animal. 



Respecting the specific identity of the German and British 

 specimens, there cannot be any doubt. The Baron von Schauroth 

 has very kindly favoured me with a specimen of Palccocrangon 

 2')rohlematica, Avhich, together with a series of clay casts of other 

 German specimens, quite establishes their identity with the pos- 

 terior fragments of our own district. 



2. Chemnitzia Roessleri, Geinitz^ sp. 



During the past year this species has repeatedly occurred to 

 me at Tunstall Hill. One perfect individual has nine whorls ; 

 the apex is finely pointed, and the aperture is ovate, with a 

 reflexed inner lip. 



3. Chiton Howseanus, sp. nov. 



Professor De Koninck has lately described — in the " Bulletins 

 de I'Academie Royale de Belgique," 2me serie, 1857 — a new 

 species of Chiton (C Grai/anus), from the Upper Silurian of 

 Dudley, which bears a strong resemblance to this species. 



4. HiPPOTHOA VoiGTIANA, lung, Sj^. 



Although I have discovered several new specimens of this 

 Pohjzoon at Tunstall, it is somewhat remarkable that the cells of 

 all of them are as minute as those of the specimen which is 

 figured, and that in no instance do they approach in size the 

 cells of the specimen which Professor King found at Humbleton. 

 This peculiarity may be due to some local variation of condition, 

 under which these members of the species existed, or it may 

 imply a specific distinction; but until perfect, or more complete 

 specimens, of the Humbleton variety be found, it will perhaps 

 be as well to consider both of them as belonging to one species. 

 The examples lately found add little to our previous knowledge 



VOL. III. I'T. IV. 1 N 



