400 PROTOZOOLOGY 



Genus Valvulina d'Orbigny (Fig. 186, e) 

 Test with whole body labyrinthic, large, flattened, or cylindrical; 

 recent Family 14 Neusinidae 



Genus Neusina Goes 

 Test trochoid at least while young 



Mostly free, typically trochoid throughout; fossil and recent. . 

 Family 15 Trochamminidae 



Genus Trochammina Parker and Jones (Fig. 186, /) 

 Attached; young trochoid, later stages variously formed; fossil and 

 recent Family 16 Placopsilinidae 



Genus Placopsilina d'Orbigny (Fig. 186, g) 



Free; conical, mostly of large size; fossil only 



Family 17 Orbitolinidae 



Genus Tetrataxis Ehrenberg (Fig. 186, h) 

 Test coiled in varying planes, wall imperforate, with arenaceous 



portion only on the exterior; fossil and recent 



Family 18 Miliolidae (in part) 



Genus Spiroloculina d'Orbigny (Fig. 186, i) 

 Test calcareous, imperforate, porcellaneous 



Test with chambers coiled in varying planes, at least in young; aperture 

 large, toothed; fossil and recent. .Family 18 Miliolidae (in part) 



Genus Triloculina d'Orbigny (Fig. 186, j) 

 Test trochoid; fossil and recent Family 19 Fischerinidae 



Genus Fischerina Terquem (Fig. 186, k) 

 Test planispiral at least in young 



Axis very short, chambers usually simple; fossil and recent 



Family 20 Ophthalmidiidae 



Genus Vertebralina d'Orbigny (Fig. 186, I) 

 Axis short, test typically compressed and often discoid, chambers 



mostly with many chamberlets; fossil and recent 



Family 21 Peneroplidae 



Genus Peneroplis Montfort (Figs. 4; 187) 



Axis typically elongate, chamberlets developed; mainly fossil 



Family 22 Alveolinellidae 



Genus Alveolinella DouvilI6 (Fig, 186, m) 



Test globular, aperture small, not toothed; recent only 



Family 23 Keramosphaeridae 



