08TEAC0DA. 81 



Cytherc (Bah-dia) pleheia, Kirkby & Jones, 1859, Trans. Tynes. Nat. Field- 

 club, vol. iv. p. 141, pi. ix. figs. 1, 2, woodcuts la, lb, Ic, and p. 1(51, pi. xi. 

 fig. 8; J. W. Kii'kbv, 18G2, Ann. & Mag. Nat. Hist. :W ser. vol. x. p. 203, 

 pi. iv. figs. 5, 6, 9 (Carb. Sli.), pi. iv. figs. 7, 8, 10 (Permian). 



Bairdia plebeia, var. amygdalina, Kirkby & Jones, 1859. Carboniferous 



Limestone, Ireland ; Permian, Durham. 

 Bairdia mucronata?, Kirkby, 1858, Ann. & Mag. Nat. Hist. 3rd ser. vol. ii. 



p. 327, pi. X. fig. 11. 

 B. plebeia, vai'. ami/;/dalina, Kirkby & Jones, 1859, Trans. Tynes. Nat. Field- 

 club, vol. iv. p. 145, pi. ix. fig. 11, woodcut 5. 



Bairdia plebeia, var. caudata, Kirkby, 1859. Permian, Durham. 



Bairdia mucronata, Kirkby, 1858, Ann. & Mag. Nat. Hist. 3rd ser. vol. ii. 



pp. 327, 328, pi. X. figs. 9-10. 

 B. plebeia, var. caudata, Kirkby & Jones, 1859, Trans. Tyneside Nat. Field-club, 



vol. iv. p. 143, pi. ix. figs. 9, 10, & 12, and p. 168, pi. xi. tigs. 17, 18«-c. 



Bairdia plebeia, var. elongata, Kirkby, 1858. Carb. Limestone, Ireland ; 



Permian, Durham. 



Bardia plebeia, var. elonijata, Kirkby, 1858, Ann. & Mag. Nat. Hist. 3rd ser. 

 vol. ii. p. 325, pi. X. figs. 4 & 4rt ; Kirkby & Jones, 1859, Trans. Tyneside 

 Nat. Field-club, vol. iv. p. 145, pi. Lx. tig. 4. 



Bairdia plebeia, var.,gfrandis, Kirkby & Jones, 1859. Permian, Durham. 



Cijthere (Bairdia) ciirta, Jones, 1850, in King's Perm. Foss., Mon. Pal. Soc. 



p. 04, pi. xvii. figs. 21 & 22. 

 Cythere (Bairdia) plebeia, yar. yrandis, Kirkby & Jones, 1859, Trans. Tyneside 



Nat. Field-club, p. 162, pi. xi. figs. 13a, 13b. 



Bairdia plebeia, var. Neptuni, Kirkby, 1858. Permian, Durham. 



Bairdia plebeia, var. Neptuni, Ivirkby, 1858, Ann. & Mag. Nat. Hist. 3rd ser. 

 vol. ii. p. 325, pi. X. fig. 5 ; Kirkby & Jones, 1859, Trans. Tyneside Nat. 

 Field-club, vol. iv. p. 145, pi. ix. fig. 5, woodcut 7. 



Bairdia plebeia, var. Reussiana, Kirkby, 1858. Permian, Durham. 



Bairdia Reussiana, Ivirkbv, 1858, Ann. & Mag. Nat. Hist. ord. ser. vol. ii. 

 p. 326, pi. X. tig. G. 



B. plebeia, var. Reussiana, Kirkby & Jones, 1859, Trans. Tyneside Nat. Field- 

 club, vol. iv. p. 14(), pi. ix. fig. 6, woodcut 8. 



Bairdia plebeia, var. rhombica, Jones, 1S59. Permian, Durham. 



Cytherc (Bairdia) plebeia, vai\ rhombica, Kirkbv & Jones, 1859, Trans. Tyneside 

 Nat. Field-club, p. 162, pi. xi. figs. 10, 11, 12rt, 126. 



Bairdia plebeia, var. ventricosa, lurkby, 1S5S. Permian, Durham. 



Bairdia ventricosa, Kirkby, 1858, Ann. & Mag. Nat. Hist. 3rd ser. vol. ii. 

 p. 326, pi. X. tig. 3. 



Bairdia (Cythere ?) plebeia, var. ventricosa, Ivirkby & Jones, 1859, Trans. Tyne- 

 side Nat. Field-club, vol. iv. p. 146, pi. x. fig. 3. 



H 



