NODOSARIN &. 67 
acutely oval in cross section, we might regard it as a Marginulina, such as M. Webdiana, 
D’Orb.," and WZ. obliqua, Reuss ;* and, indeed, it has almost as much right to be in that 
group of the Nodosarine as among the Vaginuline. 
VAGINULINA LINEARIS, Montagu. PI. I, figs. 1O—12. 
(For synonyms, see above, p. 66.) 
Characters.—Shell straight or bent, more or less compressed ; chambers compactly 
set on, more or less oval in section; ornamented in a variable degree with delicate 
parallel riblets, mostly oblique to axis of the shell; aperture excentric. Length 
‘th inch. 
Whether in the fine specimens from the Crag of Sutton (collected by Mr. S. V. 
~ Wood) we have large Dentaline obliquestriate, imperfectly ornamented, or Vaginuline 
fineares, more Nodosarian in their make than usual, it is difficult to say. We adopt the 
latter supposition. In many instances Vaginulina linearis loses its compressed shape, and 
takes on more inflated chambers in its further growth, becoming Dentaline; and such 
seems to have been the habit of the Sutton specimens. After all, it is clear that neither 
D. obliquestriata nor V. linearis are real species, and can be separately referred to only 
for convenience. 
As Marginulina Webbiana, D’Orb., and JV. obliqua, Reuss, are almost indistinguishable 
from Vaginulina levigata, so M. vaginella and M. semicostata, Reuss,* are Marginuline 
conditions of V. linearis ; and V. recta, Karrer,* may be said to be the Marginuline form 
of V. legumen proper. 
The elegant Foraminifer illustrated by pl. 5, fig. 2, ‘Sitzung. Akad. Wiss., Math.- 
Nat. Cl.,’ vol. 1, part i, 1864, and described at p. 26, op. cit., by Professor Reuss, as a 
variety of Habellina ensiformis, Miimst. and Roem., represents the fully costate condition 
of Vaginulina legumen, the common specimens of var. /inearis being only partially covered 
with riblets. How this Vaginulina passes into Flabel/ina may be seen by Reuss’s figs. 
23 and 24, pl. 2, ‘Sitzung. Akad. Wiss.,’ vol. xviii, 1855; whilst Cristellaria gladius, 
Phil., fig. 31, of the same plate, shows Vaginulina legumen becoming a Cristellaria. In 
fact, links between all the Wodosarine may readily be found. 
As for V. linearis, this form of Vaginulina only differs from the sub-typical V. /egumen 
in costation of the surface of the shell, a character of extreme variability. Many speci- 
mens only show these markings on the first two or three chambers, whilst in others they 
are apparent over the greater portion, and in some cases over the whole length of the 
1 ¢ Foram. Canaries,’ 1839, p. 124, No. 4, figs. 7—11; and ‘Foram. Amér. Mérid.,’ p. 24, pl.5, figs. 17, 18. 
2 «Denks. Akad. Wien.,’ vol. vii, 1854, p. 69, pl. 25, fig. 9. 
3 *Zeitsch. Deutsch. Geol. Gesell.,’ vol. iii, 1851, p. 152, pl. 8, figs. 2, 3. 
4 ‘Novara-Exped.,’ Abth. ‘‘Palzont.,” p. 74, pl. 16, fig. 2. 
