352 



PROTOZOOLOGY 



Fig. 161. a, Lagena striata, X50 (Rhumbler) ; b, Elphiduim strigilata, 



X40 (Klihn); c, Operculina ammonoides, X50 (Kiihn); d, Pavonina 



flaheUiJormis, X30 (Brady); e, Hantkenina alabamensis, X40 (Cush- 



man); f, Bolivina 'punctata, XlOO (Ktihn); g, Rotalia beccarii, X40 



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



Genus Operculina d'Orbigny (Fig. 161, c) 



Test generally biserial in at least microspheric form, aperture 



usually large, without teeth; fossil and recent 



Family 28 Heterohelicidae 



Genus Pavonina d'Orbigny (Fig. 161, d) 



Test planispiral, bi- or tri-serial with elongate spines and lobed 

 aperture; fossil and recent Family 29 Hantkeninidae 



Genus Hantkenina Cushman (Fig. 161, e) 



Test typically with an internal tube, elongate 



Aperture generally loop-shaped or cribrate; fossil and recent. . 

 Family 30 Buliminidae 



Genus Bolivina d'Orbigny (Fig. 161, /) 



Aperture narrow, curved, with an overhanging portion; 

 mostly fossil, also recent Family 31 Ellipsoidinidae 



Genus Ellipsoidina Seguenza 



Test trochoid, at least in young of microspheric form, usually 

 coarsely perforate; when lenticular, with equatorial and 

 lateral chambers 



