402 PROTOZOOLOGY 



Genus Lagena Walker and Jacob (Fig. 188, a) 



Test biserial or elongate spiral; fossil and recent 



Family 25 Polymorphinidae 



Genus Pol3anorphina d'Orbigny 



Test not vitreous; aperture not radiating 



Test planispiral, occasionally trochoid, then usually with processes 

 along the suture lines, septa single, no canal system ; fossil and 

 recent Family 26 Nonionidae 



Fig. 188. a, Lagena striata, X50 (Rhumbler); b, Elphidium strigilata, 

 X40 (Kiihn); c, Opercidina amynonoides, X50 (Kiihn); d, Pavonina 

 flabelliformis, X30 (Brady); e, Hantkenina alabamensis, X40 (Cushman); 

 f, Bolivina ■punctata, XlOO (Kiihn); g, Rotalia beccarii, x40 (Kiihn); h, 

 Asterigerina carinata, X30 (d'Orbigny from Kiihn). 



Genus Elphidium Montfort (Figs. 5; 184, C; 188, h) 



{Polysiomella Lamarck) 



Test planispiral, at least in young, generally lenticular, septa double, 



canal system in higher forms; fossil and recent 



Family 27 Camerinidae 



Genus Operculina d'Orbigny (Fig. 188, c) 



Test generally biserial in at least microspheric form, aperture usually 



large, without teeth; fossil and recent 



Family 28 Heterohelicidae 



