ORDER I FORAMINIFERA 27 
made up of Miliola remains; at the present day calcareous deposits are being 
formed by Biloculina in the North Sea west of the coast of Norway. Milila 
begins in the Triassic, and attains its maximum development in the Tertiary 
and Recent periods. 
Fabularia, Defr. (Fig. 26). Like Biloculina, but relatively larger. Oral 
aperture sieve-like ; chambers not hollow, but filled with porcellaneous cal- 
careous matter, and perforated by numerous anastomosing canals which run 
parallel with the axis of convolution. Abundant in Eocene of the Paris 
basin. 
Vertebralina, Orb. (Fig. 27). Test consisting of coil-shaped loops at 
commencement, afterwards becoming rectilinear. ‘Tertiary and Recent. 
Sub-Order D. VITRO-CALCAREA. Schwager. 
Test calcareous, vitreous, perforate ; more rarely silicious, or silicious with vitro- 
perforate substratum , punctured by numerous fine tubules for the emission of pseudo- 
podia. Silurian to Recent. 
Family 1. Lagenidae. Carpenter. 
Test perforated only by very fine and closely-set tubules, without supplemental 
skeleton or canal system. 
Lagena, Walker (Fig. 28, 4). Test single-chambered, spherical, ovate, 
or flask-shaped, with terminal oral aperture. Silurian to Recent. 
Nodosaria, Lam. (Fig. 28, B). Test rod-shaped; chambers arranged in a 

Fie. 28. 
A, Lagena semistriata, Williamson. Antwerp Crag (Pliocene); Antwerp. B, Nodoswria spinicosta, d’Orb. 
Tegel (Miocene) ; Baden, near Vienna. C, Dentalina elegans, VOrb. Same locality. D, Cristellaria rotulata, Lam. 
Scaphiten-Planer (Turonian); Bohemia. 2, Vaginulina recta, Reuss. Neocomian ; Salzgitter, Hanover. IF, 
Lingulina costata, VOrb. Tegel (Miocene); Baden, near Vienna. E 
straight line and set off from one another by constrictions; oral aperture 
round, terminal. Widely diffused from Silurian to Recent. 
Dentalina, VOrb. (Fig. 28, C). Like the preceding, but slightly bent. 
Carboniferous to Recent. 
Vaginulina, VOrb. (Fig. 28, £). Test straight, laterally compressed ; 
segments flattened, with obliquely directed septa. Triassic to Recent. 
Marginulina, VOrb. Early segments curved or helicoid, later ones ree- 
tilinear. Oral aperture slit-like. Triassic to Recent. 
Cristellaria, Lam. (Fig. 28, D). Test regularly plano-spiral, with convolu- 
eee completely enveloping one another. Oral aperture round. ‘Triassic to 
ecent, 
