L-R: Head of male (dorsal view); Mature male specimen; Female with ripe ova; Head of femaleCoe, W. R. (1904). Nemerteans of the Pacific coast of North America. Part II. Harriman Alaska Series. 11, 111–220.
Dorsal view of head to show arrangement of ocelli.(from Coe, W. R. (1901). Papers from the Harriman Alaska Expedition. XX. The nemerteans.. Proc. Wash. Acad. Sci.. 1-110.)