PHYLUM PROTOZOA 



25 



2.Lagena 



4.Frondicularia CCIobigerina 



Q.PIanorbutino 



lt.Nummulites 



Fig, 5. — Shells of Foraminifera. In 5, #, and 5, a 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 (s. si'); and 10 of a form with over- 

 lapping whorls ; in 11a half the shell is shown in horizontal section ; b is a ver- 

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

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



