66 
THE VOYAGE OF H.M.S. CHALLENGER. 
Sub-family 2. Trochammininse, — test thin ; composed of minute sand-grains 
incorporated with calcareous or other inorganic cement, or embedded in a chitinous 
membrane ; exterior smooth, often polished ; interior smooth or (rarely) reticulated ; 
never labyrinthic. 
Test typically consisting of a single Orbulina- like chamber 
with several mammillate apertures, . . . Thurammina, Brady. 
(Sub-genus — Thuramminopsis, Haeusler). 
Test monothalamous, elongate ; broad and rounded at one 
end, tapering to a point at the other; aperture 
large, curved or irregular, .... 
Test consisting of a single rounded chamber, or, more 
usually, of several chambers in a single straight or 
arcuate series, ..... 
Test free, formed of a tube coiled upon itself in various 
ways ; sometimes constricted at intervals, never 
truly septate, ..... 
Test free or rarely adherent ; Rotaliform, nautiloid, or 
trochoid ; more or less distinctly septate, 
Test Rotaliform, convex ; free, or adherent ; with elongate- 
oval calcareous spicules proper to itself, 
Test adherent ; consisting either of a single tent-like 
chamber, or of a number of such chambers connected 
by adherent stoloniferous tubes, 
Hippocrepina, Parker. 
Hormosina, Brady. 
Ammodiscus, Reuss. 
Trochammina, Parker & Jones. 
Carter ina, Brady. 
Webbina, d’Orbigny. 
Sub-family 3 . Endothyrinse, — test more calcareous and less sandy than in the 
other groups of Lituolidce ; sometimes perforate ; septation distinct. 
Test Nodosariform, finely arenaceous, nearly smooth 
externally ; interior sometimes slightly labyrinthic ; 
aperture simple, ..... 
Test cylindrical, growing attached by the basal extremity; 
consisting of a line of very short cylindrical segments 
placed one above the other. Interior of the chambers 
labyrinthic ; aperture terminal, cribrate, 
Test lenticular, consisting of a planospiral tube with a de- 
posit of shell-substance on both faces, thickest near 
the middle. Tube sometimes slightly constricted 
at intervals. Shell -wall more or less perforate, 
Nodosinella, Brady. 
Polyphragma, Reuss. 
Involutina, Terquem. 
