| author: | Hyman LH |
| title: | Studies on the morphology, taxonomy, and distribution of North American triclad Turbellaria. IV. Recent European revisions of the triclads, and their appl to American forms, with a key to the latter, and new notes on distribution. |
| publication: | Trans Am Microsc Soc 50:316-335 |
| year: | 1931 |