NO. 4 



FORAMINIFERA CUSHMAN 



17 



There is here given for the benefit of workers on the group an 

 outHne of the classification now used, with brief descriptions of the 

 famihes, subfamiHes and many of the genera. There are many more 

 generic names in current use and a very great number now discarded, 



Fig. 8. — Polymorphina showing a and b, two different side views, 

 and c, apertural view with radiate aperture. 



Fig. 9. — Uvigcrina showing a and b, two different views, and c, apertural view. 



Fig. 10. — Quinqueloculina showing a and b, two different side views ; a, with 

 four chambers ; b, the opposite side with but three chambers, and c, apertural 

 view, the aperture with a single tooth. 



Fig. II. — Biloculina, a, front view; b, side view; and c, apertural view, 

 the aperture with a large broad tooth. 



but most of those commonly used will be found here. Most of these 

 have illustrations drawn from the publications of the U. S. National 

 Museum. 



Family 1. GROMIDAE 



Test membranous or chitinous ; aperture if present either single 

 and terminal or one at each end of the test ; fresh water or marine. 

 Recent only, no fossils known. 



