typhlosolis

Updated: July 6, 2026

The intestine presents a remarkable structure, the typhlosolis, or, as the old anatomists called it, an intestine within an intestine; and Claparede has shown that this consists of a deep longitudinal involution of the walls of the intestine, by which means an extensive absorbent surface is gained. The circulatory system is well developed.

Charles Darwin - The formation of vegetable mould through the action of worms, with observations on their habits