32 



PROTOZOA— EHIZOPODA 



PHYLUM I 



Family 8. Rotalidae Carpenter. 

 Test calcareous, perforate, free or adherent, typicalhj spiral at hast in the young. 



Siibfamily A. Spirillininae Brady. 



Test a flat spiral, without divisions, free or attached. 



Spirillina Ehrenberg. Test a planospiral undivided tube, free or attached. 

 Miocene to Recent. 



Subfamily B. Eotalinae Carpenter. 



Test calcareous, rarely arenaceous or siliceous, finely or coarsely perforated, 

 frequently with intermediate skeleton, free or adherent, turbinate or discoidal in 

 contour. Segments usually arranged in an elongated spire, although in some forms 

 irregularly 



Discorhina Parker and Jones (Fig. 19, A, B). Test coarsely perforated, 



Fig. 19. 



Ä, Discorhina (Asterigerina) planorbis d'Orb. Miocene (Leithakalk) ; Nussdorf, near Vieima. B, Discorhina 

 sp. Recent. a, Under side ; h, Upper side ; c, Lateral view ; (/, Median section. C, Planorhulina mediter- 

 ranensis d'Orb. Recent ; Mediterranean. a, Inferior surface ; h, Superior surface ; c, Transverse section. 



turbinoid ; lower surface broad and flat ; umbilicus often filled with deposit 

 of intermediate skeleton. Cretaceous to Recent. 



Fig. 20. 



A, Rotalia heccari Lin. Pliocene ; Sienna, Italy. B, Pulvinulina partsiM d'Orb. Miocene (Tegel); Baden, 

 near Vienna. C, Endothyra panderi Möller. Carboniferous Limestone; Russia. 20/^, j)^ Endothyra parva 

 Möller. Lower Carboniferous ; Russia. Longitudinal section. loo/^. 



Planorhulina Parker and Jones (Fig. 1 9 G). Test coarsely perforated, com- 

 planate, usually attached, upper and lower surfaces dissimilar : early segments 



