| Citation | Iwata, F., 1954 The fauna of Akkeshi Bay. XX. Nemertini in Hokkaido (revised report). Reprinted from the Journal of the Faculty Science, Hokkaido University. Series VI, 12(1-2):39 p. |
| Ref. | 907 Iwata, F., 1954 |
| Page | 7-8,37 |
| Named Used as Valid | Procephalothrix filiformis |
| Locality | |
| Distribution | Japan, England and Scotland. |