FORAMINIFERA 



63 



Despite the apparent uniformity of the protoplasmic body in 

 this group, the shell is infinitely varied in form. As Carpenter 



2.Lagena 



a 



4.Frondicularia 6.Globigerina 



S.S/C. 



9.Planorbulina 



FIG./13. Shells of Foraminifem. In 3, 4, 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.sk) ; and 10 of a form with overlapping 

 whorls ; in 11a half the shell is shown in horizontal section ; b is a vertical section ; 

 a, aperture of the shell ; 1-15, successive chambers, 1 being always the oldest or 

 initial chamber. (From Parker and Haswell, after other authors.) 



writes, in reference to the Arenacea, " There is nothing more 

 wonderful in nature than the building up of these elaborate and 

 symmetrical structures by mere jelly-specks, presenting no traces 



