58 FORAMINIFERA OF THE CRAG. 
of Nodosarie, and hybrid individuals being almost as common as any of the so-called 
typical varieties. 
Dentaline with a central aperture (Pl. I, fig. 9, for instance) are merely bent 
Nodosaria. When the aperture is excentric, and the shell is tapering and curved, we 
have a “ Dentalina” if it be round in transverse section, and “ Vaginulina” if it be 
compressed. But often a shell is Vaginuline (compressed) in its early growth and 
Dentaline when old, and this is the case with fig. 10, a Dentaline form of Vaginulina 
hinearis. 'The compressed forms are often straight, and therefore most of the Vaginuline 
are straight rather than curved. If in a compressed shell, stouter than the tapering 
forms, and commencing with a relatively larger segment, or with coiled segments, the 
septal apertures follow the convex margin, we have a “Marginulina” (fig. 36) ; and a stout 
Nodosarian shell, circular in section, and with its septal apertures marginal, is also a 
“ Marginulina” (Pl. I, fig. 21). If, however, these straight, stout, oblique-chambered 
Nodosarine, with marginal aperture, be much compressed at the edges (being then acute- 
oval in transverse section), they pass as Vaginuline (Pl. IV, fig. 9). 
It is very difficult, therefore, to place all straight Nodosarian specimens definitely in 
one or other of these groups, which are quite artificial; for Marginuline and Dentaline 
forms of Wodosaria raphanus (compare P1. I, figs. 4, 9, 19, 21) and similar conditions of 
NV. radicula abound, wandering from Glanduline- and Linguline to Cristellaria, 
Flabelline, &c., without any real zoological distinction. 
DENTALINA comMuUNIS, D’ Orbigny. 
a. With straight septal planes. Plate I, figs. 13—18, 20; Plate IV, fig. 10. 
NAUTILUS (ORTHOCERAS) LEGUMINIFORMIS (parte), Batsch, 1791. Conch. Seesand., 
pl. 3, fig. 8 d. 
— RECTUS, Montagu, 1808. Test. Brit. Supplem., p. 82, pl. 19, figs. 4, 4’, 7. 
NoposaRIA DENTALINA, Lamarck, 1822. Anim. sans Vert., vol. vii, p. 596, No. 2. 
a L&vieaTa, Nilsson, 1825. Act. Acad. Holm., 1825, p. 342; 1827, Petrif. 
Suec., p. 8, pl. 20, fig. 20. 
— (DENTALINA) communis, D’Ord., 1826. Ann. Se. Nat., vol. vii, p. 254, 
No. 35; after Soldani, Testac., vol. ii, pl. 105, 
fig. 0. (Montagu’s J. rectus is catalogued by 
D’Orbigny as var. a of this species.) 
~~ LHEVIGATA, Hisinger, 1837. Lethzea Suecica, p. 33. 
— (DENTALINA) GRACILIS, D’Ord., 1840. Mém. Soc. Géol. France, vol. iv, 
p. 14, pl. 3, fig. 5. 
= _ NopDOoSa, Id. Ib., figs. 6, 7. 
ae — Lornerana, Id. Ib., figs. 8, 9. 
-- LINEARIS, Roemer, 1840. Verst. Nordd. Kreid., p. 95, pl. 15, fig. 5. 
