FORAMINIFERA 



63 



Despite the apparent uniformity of the protoplasmic body in 

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



a -rit^- 



5. Spiroloculjna 



4.Fronelicularia e.Clobigerina 



g.Planorbulina 



ll.NummuliFes 



Fig. 13.-Shells of Foraminifera. In 3, 4, and 5, a shows the surface view, and 6 a 

 section ; 8« is a diagram of a coiled cell without supplemental skeleton ; 86 ol a 

 siX form with supplemental skeleton {s.sk) ; and 10 of a form -'* overlaprmg 

 whorls ; in 11« half the shell is shown in horizontal section ; 6 is a ^^rt^"™' ' 

 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 



