20 FORAMINIFERA OF THE CRAG. 



Genus — Orbiculina, Lamarck. 



Nautilus, Fichtel and Moll. 



Orbiculina, Lamarck. 



Archaias, Helenis, and Ilotus, Be Montfort. 



Orbiculina, Lamarck, Be Blainville, jyOrbigny, Williamson, Carpenter, &c. 



General cJtaraders. — Shell complanate, ear-shaped, sub-orbicular, or discoidal, usually 

 thickened at the umbilicus. In typical specimens the plan of growth is spiral, frequently 

 changing to cyclical, especially in large specimens. Septal bands narrow; chambers 

 usually divided into chamberlets. Pseudopodial apertures in one or more rows on the 

 peripheral margin of the last chamber. 



1. Orbiculina adunca, Fichtel &-adL Moll. Plate III, fig. 44. 



Nautilus aduncus (adult), Fichtel and Moll, 1803. Test. Microsc, p. 115, p). 23, 

 figs, a — e. 



— ORBICULUS (middle-aged), Id., 1803. lb., p. 112, pi. 21, figs. a—d. 



— ANGULATUS (young), Fichtel and Moll, 1803. lb., p. 113, pi. 22, figs, a — e. 

 Archaias spirans (= 0. angulata), Montfort, 1808. Conchyl. Syst., p. 190. 



IlOTES KOTALITATUS (= 0. OKBICULUS), Id. lb., p. 198. 



Helenis spatosus (= 0. adunca). Id. lb., p. 194. 



Orbiculina adunca, Lamarck, 1816. Tabl. Encycl. Meth., pt. 23, pi. 468, fig. 2. 



— ANGULATA, Id. lb., fig. 3. 



— nummata(=0.orbiculus), /c?. lb., fig. 1. 



— numismalis — /rf., 1822. Anim. s. Vert.,p. 609, No. 1. 



— angulata, Id. lb.. No. 2. 



— UNCINATA (= 0. adunca), Id. lb., No. 3.' 



ADUNCA ^ 



— ANGULATA [ Be Blainville, \^2A. Diet. Sc. Nat., vol. .\xxii ; and Malacologie, 



— numismalis pp. 373-375, after Lamarck. 



NUMMATA J 



— NUMISMALIS, i)'0;-6., 1826. Modele No. 20 ; Ann. Sc. Nat., vol. vii, p. 305,No. 1. 



— — Ehrenberg, 1838. Abliand. Akad. Berlin., 1839, pi. 3, fig. 1. 



— ADUNCA, D'Orb., 1840. Foram. Cuba, p. 64, pi. 8, figs. 8—16. 



— — Williamson, 1851. Trans. Micr. Soc. Lond., 1st ser., vol. iii, p. 105. 

 __ _ Carpenter, 1856. Pliil. Trans., vol. cxlvi, p. 547, pi. 28, figs. 1—22, 



and pi. 29, figs. 1—3. 



— — Parker and Jones, 1860. Ann. Nat. Hist., 3rd ser., vol. v, p. 181. 



— — Carpenter, 1862. Introd. Foram., p. 93, pi. 8, figs. 1—12. 



