FORAMINIFERA OF THE ATLANTIC OCEAN 



Lamarckina haliotidea — Material examined 



37 



Genus VALVULINERIA Cushman, 1926 



ValvuUneria Cushman, Contr. Cushman Lab. Foram. Res., vol. 2, 1926, 



p. 59; Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 271. 

 Rosalina (part) of Authors. 



Genoholotype. — Valimlineria californica Cushman. 



Test usually trochoid, close coiled, all chambers of the several coils 

 visible from the dorsal side, only those of the last-formed coil from 

 the ventral side, umbilicate; chambers numerous; wall calcareous, 

 finely perforate; aperture ventral, large, extending from the umbilical 

 end of the chamber nearly to the periphery and covered by a thin, 

 membrane-like plate which largely fills the umbilical area, in the 

 adult the aperture often extending into the ventral or peripheral face 

 of the chamber, sometimes becoming tripartite. 



Cretaceous to Recent. 



I have found no Atlantic material which can be definitely assigned 



to^this genus. 



Genus GYROIDINA d'Orbigny, 1826 



Gyroidina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 278. — Cushman, 



Special Publ. No. 1, Cushman Lab. Foram. Res., 1928, p. 272. 

 Rolalina (part) of Authors. 



Genotype, by designation. — Gyroidina orbicularis d'Orbigny. 



Test trochoid, usually with the ventral side convex, the umbilicus 

 small and deep; chambers in the central region usually higher than 

 the peripheral ones and separated by a depressed channel; wall 

 calcareous, finely perforate; aperture, a low arched opening on the 

 ventral side toward the umbilical area. 



Lower Cretaceous to Recent. 



This genus is abundant in some of the Albatross dredgings as the 

 tables will show. 



GYROIDINA ORBICULARIS d'Orbigny 



Plate 8, figures 1, 2 



Gyroidina orbicularis d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 278, No. 1; 

 Modeles No. 13. — Parker, Jones, and Brady, Ann. Mag. Nat. Hist., 

 ser. 3, vol. 16, 1865, p. 20, pi. 3, fig. 85. 



Rolalia orbicularis H. B. Brady, Trans. Linn. Soc. London, vol. 24, 1864, 

 p. 470, pi. 48, fig. 16; Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 706, 

 pi. 115, fig. 6 (?), (not pi. 107, fig. 5).— Wright, Proc. Roy. Irish Acad., 

 ser. 3, vol. 1, 1891, p. 492. — Kiaer, Rep't. Norwegian Fish. Mar. Invest., 



