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Foraminifera are minute shelled animalcules. They secrete a hard covering or shell made of sand or carbonate of lime. This section of Nodosaria shows the chambers.

Foraminifera

Foraminifera are minute shelled animalcules. They secrete a hard covering or shell made of sand or carbonate…

Foraminifera are minute shelled animalcules. They secrete a hard covering or shell made of sand or carbonate of lime. This is Nodosaria hispida.

Foraminifera

Foraminifera are minute shelled animalcules. They secrete a hard covering or shell made of sand or carbonate…

"A compound foraminiferan, Nodosaria. a, aperture of shell; f, food particles captured by the strands of protoplasm outside the shell; n, nucleus; sh, shell, 1-4, the successive chambers of the shell; 1, being the oldest." — Galloway

Nodosaria

"A compound foraminiferan, Nodosaria. a, aperture of shell; f, food particles captured by the strands…

This illustration shows the calcareous shell Nodosaria vulgaris. These shells are mostly very small, and yet through their abundance they have been very important in limestone-making.

Nodosaria Vulgaris

This illustration shows the calcareous shell Nodosaria vulgaris. These shells are mostly very small,…