178 PERMIAN FOSSILS. 



Janeia BiARMiCA, De Verneuil. Plate XVI, fig, 7. 



SoLEMYA BIAEMICA, Be Vemeuil. Bull. Soc. Geol. de France, 2""= serie, vol. i, p. 30, 



1844. 



— — „ Geol. Russ., vol. i, p. 223 ; vol. ii, p. 294, pi. xix, 



fig. 4 a, b, 1845. 



— — „ Keyserling, Petschora-land, p. 259, 1846. 

 (?) — — „ King, Catalogue, p. 11, 1848. 



SoLENiMYA ABNORMis, Howse. Traus. T. N. F. C, vol. i, p. 244, 1848. 



SoLEMYA BiAB,MiCA, De Fern. Geinitz, Versteinerungen, p. 8, pi. iii, fig. 34 a, b, 1848. 



Diagnosis. — " Transverse, very inequilateral, and gaping at its extremities." " The 

 posterior side is much longer than the anterior one :" it is also " wider, and more 

 rounded."! (De Verneuil.) 



I regret that my specimens of this interesting shell are so imperfect, as to prevent 

 my adding much to the provisional description given of it by M, de Verneuil. The 

 specimen figured in the ' Geology of Russia,' pi. xix, fig. 4, is an internal cast, and 

 smooth, which is probably the character of the external surface of the valves, with 

 the exception of some rather obscure wrinkles running parallel to the free margins, as 

 in the testiferous specimen represented in PI. XVI, fig, 7 : the posterio-ventral margin 

 of the valves appears to slope upwards, that is, posterio-dorsally. The specimen just 

 cited is a simple valve, I am therefore unable to say whether or not it agrees with the 

 one figured by De Verneuil, in being open at the extremities. The description given by 

 Geinitz of the specimen figured in the ' Versteinerungen' is quite applicable to those 

 occurring in England, 



Janeia biarmica is a rare fossil, and has only occurred to me at Tunstall Hill and 

 Humbleton Cluarry. M. de Verneuil found it in the limestones, associated with 

 gypsum, forming the base of the Permian system at Kniazpavlova, government of 

 Nijni-Novgorod : some badly-preserved specimens, referred with doubt to the same 

 species, were found by this author at Gorodok, on the Tchusovaya, and in the valley 

 of Karla near Nijni-Troisk, in the district of Bielebei. Count Keyserling states that it 

 occurs in the Permian Limestone on the Wei near Kischerma, in Petschora-land. 

 According to Geinitz, M. Spengler discovered a specimen (the one figured in the 

 ' Versteinerungen') in the Kupferschiefer of Kamsdorf. I possess a specimen of a 

 Janeia from the Mountain-limestone of Redesdale, Northumberland, apparently 

 undistinguishable from the present species. 



1 Geol. Euss., vol. ii, p. 294. The terms anterior audi posterior, in the above, are conversely applied to 

 what they are in the original diagnosis. 



