60 
THE VOYAGE OF H.M.S. CHALLENGER. 
of the individual types, will enable the collector to distinguish between the modifications 
of collateral genera belonging to the same Family, or even sometimes between isomorphous 
varieties much less closely related. 
Sub-Kingdom — P R 0 T 0 Z 0 A. 
Class— RHIZOPODA. 
Order — Foraminifera — (Reticulari a) . 
Family I. GROMIDZE. 
Test chitinous ; smooth or encrusted with foreign bodies ; imperforate ; with a pseudo - 
podial aperture at one or both extremities ; pseudopodia long, branching, reticulated. 
A. Aperture single, terminal. 
Test rather large, ovate or pyriform, with the mouth in 
a depression at the middle of the broad end, which 
is more or less four-lobed, .... Lieberkuehnia, Claparede and 
Lachmann. 
Test minute, ovate ; somewhat bilateral owing to the 
one-sided position of the produced collar-like mouth. 
Cavity of the test only partially filled. Pseudo- 
podia given off from an oral column. Often found 
in colonies, ...... Mikrogromia, R. Her twig 
Test large, ovate or rounded, symmetrical in form, 
flexible. Mouth terminal ; pseudopodia much re- 
ticulated. Possessing one or more nuclei ; contrac- 
tile vacuole often wanting, .... Gromia, Dujardin. 
Test large, ovate, built up of foreign bodies (diatoms and 
the like). Pseudopodia of two sorts ; the one long, 
branching and arborescent, issuing from the mouth ; 
the other fine and hair-like, not reticulated, spring- 
ing from between the shell particles (perhaps not 
true pseudopodia). Nucleus single, large. Contrac- 
tile vacuole present, .... Diaphoropodon, Archer. 
