FORAMINIFERA 405 



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. 189, 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 



Brady, B. H. 1884 Report on the Foraminifera dredged by H.M.S. 



Challenger, during the years 1873 to 1876. Rep. Voy. Challenger, 



Vol. 9. 

 CusHMAN, J. A. 1940 Foraminifera: their classification and economic 



use. Third edition. Cambridge, Mass. 

 Myers, E. H. 1935 The life history of Patellina corrugata William- 

 son, a foraminifer. Bull. Scripps Inst. Oceanogr. Uni. Calif., 



Tech. Ser., Vol. 3. 

 1936 The life-cycle of Spirillina vivipara Ehrenberg, with 



notes on morphogenesis, systematics and distribution of the 



Foraminifera. Jour. Roy. Micr. Soc, Vol. 56. 

 1938 The present state of our knowledge concerning the life 



cycle of the Foraminifera. Proc. Nat. Acad. Sci., Vol. 24. 



1940 Observations on the origin and fate of flagellated 



gametes in multiple tests of Discorbis (Foraminifera). Jour. Ma- 

 rine Biol. Ass. United Kingdom, Vol. 24. 

 Rhumbler, L. 1904 Systematische Zusammenstellung der rezenten 

 Reticulosa (Nuda u. Foraminifera). Arch. f. Protistenk., Vol. 3. 



