504 PROTOZOOLOGY 



Genus Planorbulina d'Orbigny 



Test trochoid in very young, later growing upward 



Later chambers in loose spiral; fossil and recent 



Family 42 Rupertiidae 



Genus Rupertia Wallich (Fig. 213, g) 



Later chambers in masses or branching, highly colored; mostly 

 recent, also fossil Family 43 Homotremidae 



Genus Homotrema Hickson 



Test trochoid in the very young of microspheric form, chambers 

 becoming annular later, with definite equatorial and lateral 



chambers, often with pillars; fossil only 



Family 44 Orbitoididae 



Genus Orbitoides d'Orbigny 



References 



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Chall., 9. 

 Calvez, J. le: (1950) Recherches sur les foraminiferes. II. Arch. 



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 Cushman, J. A.: (1948) Foraminifera: their classification and eco- 

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 Illing, Margaret A.: (1952) Distribution of certain Foraminifera 



within the littoral zone on the Bahama Banks. Ann. Mag. Nat. 



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 Myers, E. H.: (1935) The life history of Patellina corrugata, etc. 



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Phleger, F. B.: (1951) Ecology of Foraminifera, northwest Gulf of 

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Rhumbler, L.: (1904) Systematische Zusammenstellung derrezen- 

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