REPOET ON THE FORAMINIFERA. 
73 
Test free or adherent, Eotaliform; the inferior face generally 
more convex than the superior. Shell-wall coarsely 
porous ; surface sometimes tuberculated, especially 
in old shells. Aperture a curved slit at or near the 
superior margin of the inner edge of the final seg- 
ment, sometimes with phialine neck and lip, 
Characters similar to those of Truncatulina, except that 
the two faces are more nearly alike, the general 
contour being biconcave or subnautiloid and the 
whorls more or less evolute, 
Test adherent, spiral ; convex or monticular in form ; 
segments few, somewhat inflated, either spreading 
radially or superimposed vertically j aperture at the 
apex of the final segment sometimes situated in a 
prolonged simple or arborescent tube. Canal system, 
when present, rudimentary, 
Test columnar, growing attached by a slightly spreading 
base ; segments numerous, spirally arranged ; aper- 
ture at the inner margin of the terminal segment, . 
Test Eotaliform, superior side usually thickest ; shell, 
with rare exceptions, very finely porous ; segments 
fewer in number than in the other Eotalinse. Shell- 
thickening usually taking the form of external sutural 
limbation. Aperture typically a large slit at the base 
of the umbilical margin of the last segment ; often 
irregular, both as to form and position. Face of the 
terminal segment sometimes inflated and studded 
with Orbuline perforations. Some species pelagic, . 
Test Eotaliform, shell-wall very finely porous ; exogenous 
deposit either in the form of embossed septal lines or 
of granulation of the sutures near the umbilicus. 
Aperture a neatly arched slit, nearly median. Larger 
species have double septa and a system of inter- 
septal canals, ..... 
Test Eotaliform, lenticular ; periphery furnished with radi- 
ating (sometimes branching) spines ; supplemental 
skeleton and canal system very largely developed, 
Truncatulina, cTOrbigny. 
Anomalina , Parker & Jones. 
Carpenteria, Gray. 
Ruperticc, Wallich. 
Pulvinulina, Parker & Jones. 
Rotalia , Lamarck. 
Calcarina, d’Orbigny. 
