32 



PEOTOZOA— RHIZOPODA 



PHYLUM I 



Family 8. Rotalidae Carpenter. 

 Test calcareous, perforate, free or adherent, ti/pically spiral at least in the young. 



Subfamily A. Spirillinixae Braclj^ 



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



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

 Miocene to Recent. 



Subfamily B. Rotalinae 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 disposed. 



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



Fio. 111. 



A, Discorbina (Asterigerina) planorbis d'Orb. Miocene (Leithakalk) ; Nussdorf, near Vieuna. B, Discorbina 

 sp. Recent, a, Under side ; b, Upper side ; c, Lateral view ; d. Median section. '/, VlanorJmlina mediter- 

 ranensis d'Orb. Recent ; Mediterranean, a, Inferior surface ; b, Superior surface ; c, Transvei'.se section. 



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

 of intermediate skeleton. Cretaceous to Recent. 



(■ D 



Fig. 2t). 



A, Rotalia beccari Lin. Pliocene: Sienna, Italy. B, ridvlnuUna jiartschi d'Orb. Miocene (Tegel) ; Baden, 

 near Vienna. C, Kiidolhurn ilnnderi Miiller. Carboniferous Limestone; Russia. '-O/i. D, Endvthyra piirm 

 Moller. Lower Carboniferous ; Russia. Longitudinal section, lof/j. 



PlanorbuUna Parker and Jones (Fig. 19 C). Test coarsely perforated, com- 

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



