178 ; PERMIAN FOSSILS. 
JANEIA BIARMICA, De Verneul. Plate XVI, fig. 7. 
SotemyA BrarMIca, De Verneuil. Bull. Soc. Geol. de France, 2” serie, vol. i, p. 30, 
1844. 
= — Me Geol. Russ., vol. i, p. 223; vol. ii, p. 294, pl. xix, 
fig. 4a, 6, 1845. 
== — 55 Keyserling, Petschora-land, p. 259, 1846. 
QQ) — — re King, Catalogue, p. 11, 1848. 
SOLENIMYA ABNORMIS, Howse. Trans. T. N. F. C., vol. i, p. 244, 1848. 
SoLEeMYA BIARMICA, De Vern. Geinitz, Versteinerungen, p. 8, pl. ili, fig. 34 a, 6, 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,’ pl. 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 Pl. 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 Quarry. 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 Wel near Kischerma, in Petschora-land. 
According to Geinitz, M. Spengler discovered a specimen (the one figured in the 
‘Versteierungen’) 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. 
! Geol. Russ., vol. ii, p. 294. The terms anéerior and posterior, in the above, are conversely applied to 
what they are in the original diagnosis. 
