70 
THE VOYAGE OF H.M.S. CHALLENGER. 
Test straight or slightly curved, angular or subcarinate ; 
usually tri- or quadrangular in section, 
Test elongate, curved ; segments circular in section ; 
aperture marginal, . 
Test elongate, compressed or complanate ; septation 
oblique ; aperture marginal, 
Test resembling a thick somewhat rounded Vaginulina ; 
septation very oblique ; aperture a long slit down 
the ventral face of the final segment, 
Test planospiral in part or entirely ; complanate, lenti- 
cular, crosier-shaped or ensiform, 
Rhabdogonium, Reuss. 
Marginulina, d’Orbigny. 
Vaginulina, d’Orbigny. 
Rimulina, d’Orbigny. 
Cristellaria, Lamarck. 
Dimorphous forms. 
Early chambers Cristellarian, later ones Nodosarian, Amphicoryne, Schlumberger. 
Early chambers Cristellarian, later ones Linguline, Lingulinopsis, Reuss. 
Early chambers Cristellarian, later ones Frondicu- 
larian, . . . . . . Flabellina, d’Orbigny. 
Early chambers Frondicularian, later ones Nodo- 
sarian, ..... Amphimorphina, Neugeboren. 
Early chambers Rhabdogonian, later ones Nodo- 
sarian (Dentaline), . . . . Dentalinopsis, Reuss. 
Sub-family 3. Polymorphininse, — segments arranged spirally or irregularly 
around the long axis ; rarely biserial and alternate. 
Segments bi- or triserial or irregularly spiral ; aperture 
radiate, 
Dimorphous form. 
Early chambers Poly morphine, later ones Nodo- 
sarian, ... 
Polymorphina, d’Orbigny. 
Dimorphina, d’Orbigny. 
Segments arranged in a more or less regular spire round 
the long axis of the shell, rarely biserial. Aperture 
simple, usually surrounded by a phialine lip ; often 
forming a prolonged terminal tube, . . . Uvigerina, d’Orbigny. 
Dimorphous form. 
Early segments Uvigerine, later ones Nodosarian, . Sagrina, Parker and Jones 
(d’Orbigny ?). 
