350 PROTOZOOLOGY 



Genus Spiroloculina d'Orbigny (Fig. 159, i) 



Test calcareous, imperforate, porcellanous 



Test with chambers coiled in varyinjr planes, at least in young; 



aperture large, toothed; fossil and recent 



Family 18 Miliolidae (in part) 



Genus Triloculina d'Orbigny (Fig. 159, j) 

 Test trochoid; fossil and recent Family 19 Fischerinidae 



Genus Fischerina Terquem (Fig. 159, k) 



Test planispiral at least in young 



Axis very short, chambers usually simple; fossil and recent 



Family 20 Ophthalmidiidae 



Genus Vertebralina d'Orbigny (Fig. 159, 1) 



Axis short, test typically compressed and often discoid, chambers 



mostly with many chamberlets; fossil and recent 



Family 21 Peneroplidae 



Genus Peneroplis Montfort (Figs. 4; 160) 



Axis typically elongate, chamberlets developed; mainly fossil. . . 

 Family 22 Alveolinellidae 



Genus Alveolinella Douville (Fig. 159, m) 



Test globular, aperture 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 

 Test planispirally coiled or becoming straight, or single-cham- 

 bered; fossil and recent Family 24 Lagenidae 



Genus Lagena Walker et Jacob (Fig. 161, a) 



Test biserial or elongate spiral; fossil and recent 



Family 25 Polymorphinidae 



Genus Polymorphina d'Orbigny 



Test not vitreous; aperture not radiating 



Test planispiral, occasionally trochoid, then usually with proc- 

 esses along the suture lines, septa single, no canal system ; 

 fossil and recent Family 26 Nonionidae 



