RHIZOPODA. 13 



Fam. 2. Euglyphina. Shell chitinous or silicious, composed of hexagonal or 

 roundish plates ; pseudopodia pointed, branched. Fresh water. Euylypha Duj. 

 (Fig. 7), Trinema Duj. 



Fam. 3. Gromidae. Test chitinous, smooth or incrusted with foreign bodies, 

 imperforate, with a pseudopodial aperture at one or both extremities ; pseudo- 

 podia long, branching, reticulated. Fresh water and marine. Gromia Duj., 

 Lieberkuhnia C. and L., Mikrogromia R. Hertwig, Diaphoropodon Archer, 

 Shepherdella Siddal. 



Fam. 4. Miliolidae. Test imperforate, mono- or polythalamic ; normally 

 calcareous and porcellaneous, sometimes incrusted with sand ; under starved 

 conditions (e.g. in brackish water) becoming chitinous or chitino-arenaceous ; 

 at abyssal depths occasionally consisting of a thin homogeneous, imperforate 

 silicious film. Marine. Squamulina Schultze, Nubecularia Defrance, Bilo- 

 culina d'Orb. , Fabularia Defrauce, Spiroloculinad'Orb., Miliolina Williamson, 

 Hauerina d'Orb., Vertcbmlina d'Orb., Orbiculina Lamarck, Orbitolites Lamarck. 

 Fam. 5. Astrorhizidae. Test invariably composite, usually of large size and 

 monothalamic ; often branched or radiate, sometimes segmented by constriction 

 of the walls, but seldom or never truly septate ; polythalamic forms never 

 symmetrical. 



Sub-fam. 1. Astrorhizince. Walls thick, composed of loose sand or mud 

 very slightly cemented. Astrorhiza Sandahl, PcJosina Brady, Syringammina 

 Brady. 



Sub-fam. 2. Pilulince. Test monothalamic ; walls thick, composed chiefly 

 of felted sponge-spicules and fine sand, without calcareous or other cement. 

 Pilulina Carpenter. 



Sub-fam. 3. Saccamminincc. Chambers nearly spherical ; walls thin, 

 composed of firmly cemented sand grains. Saccammina M. Sars, Psam- 

 mosphccra Sch., Sorosphccm Brady. 



Sub-fam. 4. Rhabdamminina-. Test composed of firmly cemented sand 

 grains, often with sponge-spicules intermixed ; tubiilar, straight, radiate, 

 branched, or irregular ; free or adherent ; with one or more apertures ; 

 rarely segmented. Rhabdammina M. Sars, Rhizaminina Brady, Sagenella 

 Brady, Botellina Carp., Haliphysema Bowerbank. 



Fam. 6. Lituolidae. Test arenaceous, usually regular in contour ; septation 

 of the polythalamic forms often imperfect, chambers frequently labyrinthic. 

 Comprises sandy isomorphs of the simple porcellaneous and hyaline types 

 (Cornuspira, Miliolina, Lagena, Globigerina, Rotalia, etc.), together with some 

 adherent species. Lituola Lamarck, Thurammina Brady, Ammodiscus Reuss, 

 Trochammina Parker and Jones, JVebbina d'Orb., Cyclammina Brady. 



Fam. 7. Textularidae. Test of the larger species arenaceous, either with or 

 without a perforate calcareous basis ; smaller forms hyaline and conspicuously 

 perforated. Chambers arranged in two or more alternating series, or spiral, 

 or confused; often dimorphous. Textularia Defrance, Cuneolina d'Orb., 

 Verneuilina d'Orb., Tritaxia Reuss, Pavonina d'Orb., Valvulina d'Orb., 

 Clavulina d'Orb., Bulimina d'Orb., Virgulina d'Orb.", Bolivina d'Orb., 

 Pleurostomclla Reuss. 



Fam. 8. Chilostomellidae. Test calcareous, finely perforate, polythalamous. 

 Segments following each other from the same end of the long axis, or alternately 

 at the two ends, or in cycles of three ; more or less embracing. Aperture, a 

 curved slit at the end or margin of the final segment. Ellipsoidina Seguenza, 

 Chilostomellct Reuss, Allomorphina Reuss. 





