PHYLUM PROTOZOA 



25 



2,Lagena 



4.Frondicularia 6.Globigerina 



O.Planorbulina 



H.Nummulilei 



Fig. 5. — Shells of Foraminif era. In 5, 4, and 5, <7 shows the surface view, and b a 

 section ; 8a is a diagram of a coiled cell without supplemental skeleton ; 8b of 

 a similar form with supplemental skeleton (5. s&); and 10 of a form with over- 

 lapping whorls; in ua half the shell is shown in horizontal section; b is a ver- 

 tical section; .*, aperture of shell; 1 — 15, successive chambers, 1 being always 

 the oldest or initial chamber. (After Carpenter, Brady, and Biltschli.) 



