| Eurylepta leoparda Freeman, 1933 | Aug 5, 1953 | shallow | sand | one specimen among other polyclads collected by Mrs. D.W. Orihel at Friday Harbor and Woodah Island in Puget Sound.  Found on a dredged tunicat.  Sexually mature, laid eggs in lab,. | 
| Leptoplana chloranota (Boone, 1929) | prior to 1933 | littoral | stones | under stones | 
| Notoplana inquieta (Heath & McGregor, 1913) | prior to 1953 |  |  |  | 
| Notoplana celeris Freeman, 1933 | prior to 1933 |  |  |  | 
| Notoplana sanjuania Freeman, 1933 | prior to 1953 |  |  | Hyman has collected several specimens alive in Puget Sound, | 
| Notoplana sanjuania Freeman, 1933 | prior to 1933 |  |  |  | 
| Pseudostylochus burchami Heath & McGregor, 1913 | May, 1941 |  |  | taken by Freeman at two points in Puget Sound and by Lynch in the same region. | 
| Acerotisa alba (Freeman, 1933) | prior to 1933 |  |  | on hydroids at the old marine station. | 
| Pseudostylochus ostreophagus Hyman, 1955 | Nov, 1953 |  |  | imported from Japan.  In one locality in Puget Sound, Mr Woelke estimated 600,000 worms per acre.  Mr. Woelke notes that this worm attacks small oysters by covering shell and boring a small hole into the shell. | 
| Kaburakia excelsa Bock, 1925 | 1953 |  |  |  |