26 PROTOZOA—RHIZOPODA CLASS I 
VOrb.), Tertiary (0. complanata, Lam.), and Recent. An important rock- 
building genus. 
Alveolina, Bose. (Borelis, Montf.), (Fig. 23). Test fusiform, elliptical, or 
spherical, usually elongated in the axis of convolution, and composed of 
spirally wound segments which completely envelop one another. Each seg- 
ment is partitioned off into long, narrow chambers by septa arranged at right 
angles to the axis, and these are subdivided into chamberlets by a second set 
of septa running transversely to the first set. Each of the secondary 
chamberlets communicates with the adjacent primary chamber by means of a 
single round aperture. In certain recent species the secondary chamberlets 
are also subdivided. The genus begins in the Cenomanian, continues in 
extraordinary profusion, and becomes a most important rock-builder in the 
Eocene (Calcaire Grossier of the Paris basin, Alveolina limestone of Istria, 
Dalmatia, Greece, and the Libyan Desert). 
Family 3. Miliolidae. Carpenter. 
Test either entirely composed of coil-like segments, or convoluted only at commence- 
ment. Primordial chamber dimorphous. Triassic to Recent. 
Miliola, Lam. (Figs. 24, 25). Segments disposed in coil-shaped loops 
about a few spirally wound primordial chambers. Each loop is constricted at 

Fic. 24. 
A, Biloculina inornata, d’Orb. From the Miocene Tegel; Baden, near Vienna. 5, Vriloculina gibba, d’Orb. 
Oligocene sand from Astrupp. C, Spiroloculina Badensii, VOrb. Miocene Tegel; Baden, near Vienna. D, Quin- 
queloculina sazorum, d’Orb. Eocene (Calcaire Grossier); Grignon, near Paris. 
the extremities so as to form a septum of its own walls. Terminal pseudo- 
podial aperture either curving in the form of a crescent about a tooth-like pro- 
jection, or branching 
dendritically (Lacazina). 
Forms having all the seg- 
ments disposed in a single 
plane, and all externally 
visible, are grouped to- 
gether in the sub-genus 
Spiroloculina, d’Orb. ; with 
allthesegments completely 

A, Longitudinal section of Fia. 26. enveloping one another, 
Biloculina inornata, d'Orb, Fabularia dis- Vertebralina mu- ' . Orb - 
(enlarged). Bb, Transverse colithes, Defr. cronata, d’Orb. Biloculina, VOr b.; segments 
section of Quinqueloculina Eocene (Caleaire Recent; Medi- disposed in three or in five 
saxorum, VOrb. (enlarged). Grossier); Paris. terranean. 
different planes, Z’riloculina 
and Quingueloculina, VOrb, The great variety and extraordinary profusion of 
this genus combine to make it one of the most important of the rock-building 
Foraminifera. Massive beds of Eocene limestone (Paris basin, Pyrenees) are 
