orthoceratite

Updated: May 28, 2025

And another, which makes a straight, many-chambered 'test, that resembles in form the chambered shell of an orthoceratite the conical mouth of each chamber projecting into the cavity of the next while forming the walls of its chambers of ordinary sand grains rather loosely held together, shapes the conical mouth of the successive chambers by firmly cementing together grains of ferruginous quartz, which it must have picked out from the general mass."

Samuel Butler - Life and Habit