28 



PROTOZOA RHIZOPODA 



CLASS I 



A, Glandulina inflata, Borneui. 

 Polymorphina injkita, Williamson. 



FIG. 29. 



Septarienthon (Oligocene) ; Herinsdorf. Ji, 

 Recent; German Ocean. C, Dimoi-phina sp. 



LinguUna, d'Orb. (Fig. 28, F). Test straight, compressed ; segments 

 attached in rectilinear series. .General aperture terminal, slit-like. Triassic 

 to Recent. 



Glanduliha, d'Orb. (Fig. 29, A). Test short, ovate; segments united in 

 rectilinear series, half-embracing one another. General aperture round, ter- 

 minal, usually tubu- 

 lated. Triassic to 

 Recent. 



FT ondicu laria, 

 Defr. (Fig. 29, D). 

 Test straight, ex- 

 tremely compressed, 

 and foliately ex- 

 panded. Chambers 

 greatly reflexed, 

 laterally embracing- 

 one another. General 

 aperture round, ter- 



Pliocene ; Sienna, Italy. D, Frondicularia Goldfussi, Reuss. Scaphiten- Planer ; rm'rml Triaeeip tn 



Diilmen, Westphalia. E, Ucigerina pygmaea, d'Orb. Tegel (Miocene) ; Baden, mi 



near Vienna. Recent. 



P o I y m o rp h in a, 



d'Orb. (Fig. 29, B). Segments irregularly helicoid, or arranged in double 

 series more or less enveloping each other and varying in shape. General 

 aperture round, terminal. Triassic to Recent. 



Dimorphina, d'Orb. (Fig. 29, C). Early chambers irregularly or triserially 

 disposed, later ones following in a straight line. Cretaceous to Recent. 



Uvigerina, d'Orb. (Fig. 29, E). Segments dissimilar, disposed in triple 

 series, and spirally wound like a snail-shell. Eocene to Recent. 



Family 2. Textularidae. Schultze. 



Test in larger forms arenaceous, with calcareous basis perforated by coarse tubules ; 

 in smaller forms vitreous, perforate ; segments regularly or only in part arranged in 

 two (rarely more than two) alternating series. 



Textularia, Defr. (Fig. 30, A). Test usually elongated, straight, tapering, 

 or turbinated. Chambers biserial, alternating, and communicating with each 

 other by means of slit-like apertures. Carboniferous to Recent. Extremely 

 abundant in the White Chalk. 



The genera Textularia, s. str., Grammostomum (Fig. 30, D), and Bolivina (Fig. 

 30, B) of the calcareous forms ; and Plecanium (Fig. 30, (7), Eigenerina, 

 Gaudryina (Fig. 30, E), Clavulina (Fig. 30, F), and Verneuilina are founded upon 

 various minor modifications. 



Bulimina, d'Orb. (Fig. 31, A, B). Test calcareous, the alternating 

 chambers arranged in an elongated spire. Triassic to Recent. 



F'alvulina, d'Orb. (Fig. 31, E). Test arenaceous with calcareous basis. 

 Chambers in triple series arranged in screw-like spiral. Carboniferous to 

 Recent. 



Climacammina, Brady (Cribrostomum, Moller), (Fig. 31, B, C). Test 

 arenaceous with calcareous basis. Chambers biserial, rectilinear. Oral aper- 

 ture porous- Abundant in Carboniferous Limestone (cf. Bigenerina, d'Orb.) 



