PROTOZOA 



91 



communicating chambers, (c) Rotalia (Jurassic to present), 

 chambers of test forming a flat spire. For examining the cham- 

 bers use transmitted light. Label chambers, large and small 

 openings. 



3. Did the protoplasm occupy one or more chambers ? 



4. What is the food of Globigerina ? How does its manner of 

 capture differ from that in Amoeba ? 



5. Describe the reproduction. 



6. What is meant by "alternation of generation"? 



7. What is the significance of the name Foraminifera ? 



8. If Foraminifera occur in all seas, why do they form such 

 masses as chalk and globigerina ooze when the muds and sands 

 accumulated at the same time have 

 so few ? 



9. Is chalk of shallow or deep 

 water origin ? Reasons. 



Fusulina (Fig. 32). Pennsylvanian. 



Test spindle-shaped (whence the 

 name from Latin fusus, spindle), 

 bilaterally symmetrical; each 

 chamber extending from end to 

 end so that each whorl completely 

 covers the preceding one ; aper- 

 ture in form of a fissure. 



Exceedingly abundant in the 

 Pennsylvanian limestone of North 

 America, Russia and Asia. 



Fig. 32. — The protozoan skeleton, 

 Fusulina secalica Say, abundant 

 in the shallow seas covering Kan- 

 sas during a part of the Penn- 

 sylvanian period. A, surface view 

 showing the fissure-like aperture 

 (a-c). B, cross section showing 

 the internal chambers and the 

 aperture {a). Both enlarged; 

 note scale of A . 



1. Sketch {a) entire fossil with 

 opening upwards, {h) cross section, 

 showing method of coiling. 



2. Comparing with Globigerina, how did the living animal 

 probably procure its food ? 



Nummulites (Fig. 33). Pennsylvanian to present. 



Test flattened, lens- or coin-shaped (whence the name from 



Latin nummulus, diminutive of nummuSy a coin). Internally 



there is a spiral series of chambers. Each whorl completely 



