| Oligocladus albus Freeman, 1933 | 1933 or earlier | | | |
| Cryptophallus magnus Freeman, 1933 | 1933 or earlier | | | |
| Stylochoplana viridis Freeman, 1933 | 1933 or earlier | | | |
| Stylochoplana longastyletta Freeman, 1933 | 1933 or earlier | | | |
| Notoplana inquieta (2) Freeman, 1933 | 1933 or earlier | | | |
| Notoplana sanguinea Freeman, 1933 | 1933 or earlier | | | |
| Notoplana sanguinea Freeman, 1933 | 1933 or earlier | | | |
| Notoplana natans Freeman, 1933 | 1933 or earlier | | | |
| Notoplana sanguinea Freeman, 1933 | 1933 or earlier | | | |
| Notoplana celeris Freeman, 1933 | 1933 or earlier | | | |
| Notoplana sanjuania Freeman, 1933 | 1933 or earlier | | | |
| Discosolenia washingtonensis Freeman, 1933 | 1933 or earlier | | | |
| Eurylepta leoparda Freeman, 1933 | 1933 or earlier | | | |
| Pseudoceros canadensis Hyman, 1953 | Jul, 1952 | | | San Juan Islands, Puget Sound, mostly crawling on Ulva and eelgrass. |
| Balgetia pacifica Ax, Ax & Ehlers, 1979 | | | coarse sand | collected intertidally and in the upper sublittoral from coarse sand beaches along the west coast of San Juan Island. |
| Nexilis epichitonius Holleman & Hand, 1962 | Jun 1965 | | | |