Paleozote Bivalved Entomostraca. 53 
Carboniferous rocks of Russia. Most of these species had 
been previously noticed by him, though not figured, in the 
‘ Bulletin Soc. Imp. Nat. Moscou,’ année 1857, p. 198, 
M. d’Hichwald’s specimens are from the Carboniferous 
Limestone of Borowitschi, in the Government of Novogorod ; 
from Carboniferous Limestone on the right bank of the 
Serena, near Goroditz, in the district of Kozel, in the Govern- 
ment of Kalonga; from Carboniferous Limestone on the 
river ‘I'scherepete, near T'schernischine, in the district of 
Likhwine, in the Government of Kalonga; from the Car- 
boniterous Dolomite of Sterlitamak, in the Government of 
Orenburg ; from the Cytherina-Limestone near the village of 
Filmonoff, on the river Oupa, in the Government of Toula; 
and from the Carboniferous Shale of Sloboda, also in the 
Government of Toula. 
From these materials D’Hichwald describes and figures the 
following species :— 
Beyrichia gibberosa, D’Eichwald, Bull. S. I. N. Mouse. 1857, xxx. ii. 
p- 312; Leth. Ross. i. v. 1859, p. 809, vii. 1860, p. 1349, pl. 52. f. 11. 
colliculus, D’Hichwald, Bull. 8. LN. Mose. 1857, xxx. ii. p. 313 ; 
Leth. Ross. i, v. 1859, p. 309, vii. 1860, p. 1348, pl. 52. f. 1. 
umbonata, D’ Hichwald, Bull. S. I. N. Mose. 1857, xxx. ii. p. 312; 
Leth. Ross. i. v. 1859, p. 809, vii. 1860, p. 1347, pl. 52. f. 10. This is 
a Kirkbya. 
striolata, D’Eichwald, Bull. 8S. I. N. Mose. 1857, xxx. ii. p. 312; 
Leth. Ross. i, v. 1859, p. 809, vii. 186), p. 1348, pl. 52. f. 14. This is 
a Kirkbya. 
Leperditia microphthalma, D’Eichwald, Cypridina, Bull. 8. I. N. Mose. 
1857, xxx. 1. p. 310; Leperditia, Leth. Ross. i. vii. 1860, p. 1386. 
Possibly a variety of LZ. Okent. 
Bairdia Qualeni, D’Eichwald, Bull. 8. I. N. Mose. 1857, xxx. ii. p. 311; 
Leth. Ross.i. v. 1859, p. 309, vii. 1860, p. 1339, pl. 52. f. 4. 
levigata, D’ Hichwald, Cypridina, Bull. 8. I. N. Mose. 1857, xxx. ii. 
p- 310; Leth. Ross. i. v. 1859, p. 809; DBarrdia, Leth. Ross. i. vii. 1860, 
p. 1542, pl. 52. £5; and var. nigrescens. Both are Leperditie, and 
probably varieties of Z. Okent. 
eequalis, D’Eichwald, Bull. 8. I. N. Mose. 1857, xxx. ii. p. 311; 
Leth. Ross. i. v. 1859, p. 309, vii. 1860, p. 1340, pl. 52. f. 6. 
excisa, D’ Hichwald, Bull. 8. I. N. Mose. 1857, xxx. ii. p. 311; Leth. 
Ross. i. v. 1859, p. 309, vii. 1860, p. 1342, pl. 52. f. 8. Possibly Cy- 
there (?) bilobata (Miinster). 
distracta, D’ Kichwald, Bull. 8S. I. N. Mose. 1857, xxx. ii. p. 311 ; 
Leth. Ross. i. vii. 1860, p. 1541, pl. 52. f. 12. Very similar to Bairdia 
mucronata, Reuss. 
curta, M‘Coy, D’Evchwald, Bull. S. I. N. Mosc. 1857, xxx. ii. p.311; 
Leth. Ross. i. v. 1859, p. 309, vii. 1860, p. 1338, pl. 52. f. 17, and var. 
f. 18. B. ampla, plebeia, and varieties. 
Judging from M. d’Hichwald’s published figures, some of 
the above species may be more appropriately placed in other 
