Figure 14: Attics and floors in Alveolinella borneensis Tan Sin Hok, Molukkas, Miocene. Transmitted light micrographs.
A: Transverse section. Position in respect to B: double arrow A. B: axial section.
at: attics; cl: chamberlet; f1: foramen (basal row): f2: foramen (second row); f3: supplementary foramina corresponding to the attics; flo: floors; s: septum.