External Appearance

(from Coe, 1904) Usually pale yellow throughout but some specimens have a distinct reddish tinge. Others may be grey, greenish, or pale green. A median pale line appears on the dorsal surface in the region of the esophagus. This is a very slender thread-like species. Body is commonly thicker in the middle and tapers toward both head and tail. Head is very long and sharply pointed when extended. Proboscis pore is ventral and farther back from the tip of the snouth. The mouth is very far back.