trilobite, Grapholite, Nautilus pie; Seas were calcareous, oceans were dry.
I will also exchange minerals for stalagmites, and a trilobite for a stalactite.
The first is revealed to us by the imprint of the trilobite, an order now lost, the most destructive of extinct beings.
trilobite—trīlo-bīte, not trĭlo-bīte nor trŏllo-bīte, as it is often called.
Naraoia can, I think, be best explained as a trilobite which grew to the adult state without losing its protaspian form.
This latter function may have been that of the median tubercle in the trilobite.
One of the most abundant fossil animals in ancient rocks is called a trilobite.
It has been a custom of long standing to compare the trilobite with Limulus.
Anything simpler than this could not, in my opinion, be classed as a trilobite.
The trilobite was the most arresting figure in the Cambrian sea, and its fortunes deserve a paragraph.
Any of numerous extinct and mostly small arthropods of the subphylum Trilobita that lived during the Paleozoic Era and are extremely common as fossils. Trilobites had a hard outer covering divided into three lengthwise and three widthwise sections. Their heads had two prominent compound eyes similar in structure to those of modern insects.