30 FORAMINIFERA 



3. Sutures, including amount of depression or elevation; 

 clearness ; amount of limbation, if any ; changes in various parts 

 or sides of the test ; direction ; straight or, if curved, the relative 

 amount; relations to the ornamentation. 



4. Wall, including relative thickness; materials of which 

 composed ; kind and relative amount of cement ; finish of the ex- 

 terior; relative size of perforations, if a perforate form; orna- 

 mentation, especially changes in different stages of develop- 

 ment or in different parts of the wall. 



5. Aperture, including changes of position at different stages 

 of development, relation to peculiar structures or modifications 

 of the chamber, development of neck or lip or ornamentation 

 directly connected with the aperture itself. 



6. Color, usually not evident in fossil forms although occa- 

 sionally of decided importance. 



