Comprehensive DescriptionRead full entry
(from Coe, W. R. (1905). Nemerteans of the west and northwest coasts of America.. Bull. Mus. comp. Zool. Harv.. 1-318)
Body usually of large size, remark ably thick and massive, usually nearly cylindrical when fully extended, but very broad and much flattened in intestinal region when strongly contracted. Head continuous with body, but esophageal region often sharply demarcated from intestinal region when contracted. Body is not coiled in a spiral, and worms do not swim, but crawl about with a snail-like motion by extending and contracting the body to an enormous extent. When contracted, intestinal region is often much flattened, with thick lateral margins; it is convex above and concave beneath, and exhibits transverse constrictions at intervals.
Ocelli wanting; proboscis sheath usually much shorter than body ; caudal cirrus absent; muscular layers of body possess a bright reddish tinge in life.
But two species of this restricted genus have as yet been described ; one of these occurs on the coasts of England and in the Mediterranean, while the other has been recorded from the latter locality only. A third species is represented in these collections by a single specimen fro m Lower California, and this specimen exceeds in bulk any nemertean as yet described.