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"The bodies of these animals are of a cylindrical form, somewhat pointed at the anterior extremity, and usually a little flattened at the tail. The skin is tough, and divided into numerous segments by transverse wrinkles, and the organs of motion are reduced to the form of a double row of bristles, running down the lower surface of the body." — Goodrich, 1859

Earth-worms

"The bodies of these animals are of a cylindrical form, somewhat pointed at the anterior extremity,…

"In their form they resemble the common earth-worm; but their bodies are furnished, besides the ventral bundles of bristles, with a series of long spines on each side. They generally have two distinct eyes, and the mouth is sometimes armed with a long proboscis." — Goodrich, 1859

Nais

"In their form they resemble the common earth-worm; but their bodies are furnished, besides the ventral…