910 Transactions of the Society. 



Specimens with oblique costae cannot be separated specifically from 

 tbe straight-ribbed forms ; every shade of variation in this particular is 

 to be met with. 



Bentalina ohliqua, " d'Orbigny," is noticeable in several British lists, 

 a perpetuation probably of an error of my own, the present form being 

 intended. D'Orbigny's '' oUiqua" is now known under Neugeboren's 

 name Nodosaria [Dentalina) mucronata, and there is no certain evidence 

 of the occurrence of this variety on our shores. 



LiNGULiNA, d'Orbigny. 



Lingulina carinata, d'Orbigny. 



Lingulina carinata, d'Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 257, 

 No. 1 ;— Modele, No. 26. 

 „ „ Williamson, 1858, Kec. For. Gt. Br., p. 14, pi. ii. 



figs. 33-35. 

 Shetland, Skye, Plymouth Sound (WilHamson) ; Irish Sea (Balkwill 

 and Wright); shore-sand, Gralway (Balkwill and Millett) ; Killybegs 

 Harbour (Wright). 



Vaginulina, d'Orbigny. 

 Vaginulina legumen, Linne, sp. 



Nautilus legumen,Jjimie, 1758, Syst. Nat., 10th ed., p. 711, No. 248; — 



1767, Ibid., 12th ed., p. 1164, No. 288. 

 Dentalina legumen, Williamson, 1858, Kec. For. Gt. Br., p. 21, pi. ii. 



fig. 45. 

 Widely distributed. 



Vaginulina linearis, Montagu, sp. 



Nautilus linearis, Montagu, 1808, Test. Brit., Suppl., p. 87, pi. xxx. 



fig. 9. 

 Dentalina legumen, var. linearis, W^ilHamson, 1858, Kec. For. Gt. Br., 



p. 23, pi. ii. figs. 46-48. 

 Widely distributed. 



Khabdogonium, Keuss. 



Bhahdogonium tricarinatum, d'Orbigny, sp. 



Vaginulina tricarinata, d'Orbignv, 1826, Ann. Sci. Nat., vol. vii. p. 258, 



No. 4 ;— Modele, No. 4. 

 Bhahdogonium tricarinatum, Balkwill and Wright, 1885, Trans. R. 

 Irish Acad., vol. xxviii. (Science) p. 344, pi. xii. figs. 17, 18. 

 Lambay ? (Balkwill and Wright) ; south-west of Ireland, 100 to 200 

 fathoms (Wright). 



Maeginulina, d'Orbigny. 



Marginulina glabra, d'Orbigny. 



Marginulina glabra, d'Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 259, 

 No. 6 ;— Modele, No. 55. 



