| 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 |  |  |  |