24 



PROTOZOA RHIZOPODA 



CLASS I 



PJieophax, Montf. (HaphsticJie, Reuss), (Fig. 14). Test free, rod-shaped or 

 slightly bent; septa simple (Itheophax) or labyrinthic (Haplostiche) ; pseudo- 

 podial aperture at extremity. Carboniferous to Recent. 



/Lihiola, Lam. (Haplophragmvm, Reuss), (Fig. 17). Test free, crosier-shaped 



FIG. 13. 



FIG. 14. 



Jlo.plostiche 

 horrida, Schwa - 

 ger. Upper 

 J urassic 



A, Saccammimt, Carteri, 

 Brady. Carboniferous Lime- 

 stone; Elfhills, Northum- 

 berland. 1/1- B, Fractured pressa 

 test, filled . with interior Gruibingen, 

 calcite. io/j (after Brady). Wiirttemberg. 



pper 

 (Im- 



Placopsiliua 

 rostrata, Quenst. 

 sp. Upper Jur- 



Trochammina 



assic (Impressa tens, Karrer. Vienna 



clay) ; clay) ; Reichen- 

 bach, Win-Item 

 berg. 



sandstone (Senonian) ; 

 Hutteldorf, near 

 Vienna. 



(Haplo-' 

 phragminm) irregu- 

 lare, Roemer. Sca- 

 phiten - Planer ; 

 Krb'ndorf, Bohemia. 



or spirally wound. General aperture simple or sieve-like ; septa simple (Haplo- 

 phragmium) or labyrinthic (Lituola). Carboniferous to Recent; particularly 

 abundant in Jurassic and Cretaceous. 



Family 3. Orbitolinidae. Zittel. 



Test silicious, imperforate, bowl-shaped, and composed of concentric rings which 

 are partitioned off into numerous chambers. 



Orbitolina, Lam. (Fig 18). Test silicious, with 

 agglutinated sandy particles ; bowl-shaped to depressed 

 conical ; upper side convex, lower side slightly hollow. 

 Periphery smooth, or with concentric bands, imperforate. 

 Test composed of multilocular rings, the chambers 

 communicating with one another on all sides by means 

 of pores. The peripheral portion of each chamber is 

 divided up into smaller compartments by two secondary 

 septa disposed at right angles to each other. Very 

 abundant in the Lower (0. lenticularis, Lam.) and Upper 

 Cretaceous (0. concava, Lam.) 



FIG. IS. 



c, Transverse section 

 larged). . 



(en- 



Sub-order C. PORCELLANEA. Schwager. 



Test calcareous, porcellaneous, imperforate. 



Under starved conditions (e.g. in brackish water) the test may assume a 

 chitinous or arenaceous character, or may become encrusted with a thin, homo- 

 geneous, silicious envelope. The majority of recent forms inhabit shallow water ; 

 only a few occur at abyssmal depths. 



