FORAMINIFERA 201 



Genus Hantkenina Cushman (Fig. 77, e) 



Test typically with an internal tube, elongate 



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



Family 30 Buliminidae 



Genus Bolivina d'Orblgny (Fig. 77,/) 



Aperture narrow, curved, with an overhanging portion; mostly 



fossil and recent Family 31 Ellipsoidinidae 



Genus EUipsoidina Seguenza 



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

 usually coarsely perforate; when lenticular, with equatorial 

 and lateral chambers 

 Test trochoid throughout, simple; aperture ventral. 



No alternating supplementary chambers on ventral side; fossil 



and recent Family 32 Rotaliidae 



Genus Rotalia Lamarck (Fig. 77, g) 



Alternating supplementary chambers on ventral side; fossil 



and recent Family ii Amphisteginidae 



Genus Asterigerina d'Orbigny (Fig. 77, h) 



Test trochoid and aperture ventral at least in the young 



With supplementary material and large spines, independent 



of the chambers; fossil and recent. . . .Family 34 Calcarinidae 



Genus Calcarina d'Orbigny (Fig. 78, a) 



With later chambers in annular series or globose with multiple 

 apertures, but not covering the earlier ones; fossil and 

 recent Family 35 Halkyardiidae 



Genus Halkyardia Heron-Allen and Earland 

 (Fig. 78, h) 



With later chambers somewhat biserial; aperture elongate in 



the axis of coil; fossil and recent Family 36 Cassidulinidae 



Genus Cassidulina d'Orbigny (Fig. 78, c) 



With later chambers becoming involute, very few making up 

 the exterior in the adult; aperture typically elongate, 

 semi-circular; in a few species circular; fossil and recent 



Family 37 Chilostomellidae 



Genus Allomorphina Reuss (Fig. 78, d) 



With chambers mostly finely spinose and wall cancellated, 

 adapted for pelagic life, globular forms with the last 



