198 HANDBOOK OF PROTOZOOLOGY 



Genus Neusina Goes 



Test trochoid at least while young 



Mostly free and typically trochoid throughout; fossils and recent 



Family 15 Trochamminidae 



Genus Trochammina Parker and Jones (Fig. 75, /) 

 Attached; young trochoid, later stages variously formed; fossil 



and recent Family 16 Placopsilinidae 



Genus Placopsilina d'Orbigny (Fig. 75, g) 

 Free; conical, mostly of large size; fossil only. .Family 17 Orbitolinldae 



Genus Tetrataxis Ehrenberg (Fig. 75, 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. 75, i) 



Test calcareous, imperforate, porcellanous 



Test with the chambers coiled in varying planes, at least in the young, 



aperture large, toothed; fossil and recent 



Family 18 Miliolidae (in part) 



Genus Triloculina d'Orbigny (Fig. 75, j) 

 Test trochoid; fossil and recent Family 19 Fischerinidae 



Genus Fischerina Terquem (Fig. 75, k) 



Test planispiral, at least in the young 



The axis very short, chambers usually simple; fossil and recent. . 



Family 20 Ophthalmidiidae 



Genus Vertebralina d'Orbigny (Fig. 75, 1) 



The axis short, test typically compressed and often discoid, cham- 

 bers mostly with many chamberlets; fossil and recent 



Family 21 Peneroplidae 



Genus Peneroplis Montfort (Fig. 76) 



The axis typically elongate, chamberlets developed; mainly fossil 



Family 22 Alveolinellidae 



Genus Alveolinella Douville (Fig. 75, m) 



Test globular, apertures small, not toothed; recent only 



Family 23 Keramosphaeridae 



Genus Keramosphaera Brady 



Test calcareous, perforate 



Test vitreous with a glassy lustre, aperture typically radiate, not 

 trochoid 



