| Amphiscolops gardineri Graff, 1911 | | | In sand of Ulva and seagrasses, with Polychoerus caudatus. | |
| Stylochus zebra (Verrill, 1882) | 1882 | low water | | on piles. |
| Eustylochus ellipticus (Girard, 1850) | Aug 1879 | low tide line | | common. |
| Planocera nebulosa Girard, 1853 | 1886 | low water mark | | under stones. |
| Anaperus gardineri (Graff, 1911) | between May and Aug 1907 | | sand | in sand in Ulva and sea grass |
| Aphanostoma diversicolor Ørsted, 1845 | between May and Aug 1907 | | sand | between Eels pond and Little Harbor, in Ulven (Ulva) |
| Polychoerus caudatus Mark, 1892 | between May and Aug 1907 | | | numerous in the Ulven (Ulva) of Little Harbor, and the sea grass on the hotel breakwater. |
| Childia spinosa Graff, 1911 | between May and Aug 1907 | | | found in the collecting tube with other species. |
| Microstomum davenporti Graff, 1911 | between May and Aug 1907 | | | at the breakwater in Ulven (Ulva) and Blasentang (Blister sea weed?) |
| Promesostoma marmoratum nudum Graff, 1905 | between May and Aug 1907 | | | 3 specimens. |
| Trigonostomum marki Graff, 1911 | between May and Aug 1907 | | | in Zostera on Red Ledge by Woods Hole, Massachusetts, USA. |
| Woodsholia lilliei Graff, 1911 | between May and Aug 1907 | | | in Zostera on Red Ledge by Woods Hole, Massachusetts, USA. |
| Woodsholia lilliei Graff, 1911 | between May and Aug 1907 | | | by Grass Island (?). |
| Phonorhynchus helgolandicus (Metschnikow, 1865) | between May and Aug 1907 | | | by Grass Island (?). |
| Phonorhynchus helgolandicus (Metschnikow, 1865) | between May and Aug 1907 | | | Butlers (?) |
| Gyratrix hermaphroditus maculata Graff, 1911 | between May and Aug 1907 | | | found in a pool on the left side of the Gardiner mansion fed by rain and sea water, which during the summer has high salinity. |
| Plagiostomum stellatum Graff, 1911 | between May and Aug 1907 | | | in Zostera |
| Plagiostomum morgani Graff, 1911 | between May and Aug 1907 | | | Butlers Point |
| Plagiostomum wilsoni Graff, 1911 | between May and Aug 1907 | | | Grass Island |
| Monoophorum triste Graff, 1911 | between May and Aug 1907 | | | 3 whole specimens from Butlers Point and Grass Island. |
| Aphanostoma diversicolor Ørsted, 1845 | 1965 or earlier | | on algae | common at Woods Hole on algae. |
| Childia groenlandica (Levinsen, 1879) | 1965 or earlier | | | |
| Polychoerus caudatus Mark, 1892 | 1965 or earlier | | | common in the Woods Hole region and regulary taken both in dredgings and on Ulva from piling and rocks. Bush notes in 1965 that it had not been reported recently. |
| Macrostomum sp. Steinbock, 1931 | 1965 or earlier | | | |
| Microstomum davenporti Graff, 1911 | 1965 or earlier | | | |
| Woodsholia lilliei Graff, 1911 | 1963 | | | Bush notes that a few specimens were believed to be taken in 1963. |
| Bdelloura candida (Girard, 1850) | 1965 or earlier | | | abundant on Limulus. |
| Bdelloura propinqua Wheeler, 1894 | 1965 or earlier | | | |
| Syncoelidium pellucidum Wheeler, 1894 | 1965 or earlier | | | found on Limulus but much less numerous than Bdelloura sp. |
| Prostheceraeus maculosus (Verrill, 1893) | 1965 or earlier | | | |
| Stylochus zebra (Verrill, 1882) | 1965 or earlier | | | |
| Stylochus ellipticus (Girard, 1850) | 1965 or earlier | | | |
| Gnesioceros floridana (Pearse, 1938) | 1965 or earlier | | | |
| Hoploplana inquilina (Wheeler, 1894) | 1965 or earlier | | | |
| Hoploplana grubei (Graff, 1892) | 1965 or earlier | | | |
| Euplana gracilis (Girard, 1850) | 1965 or earlier | | | |
| Notoplana atomata (Müller, 1776) | 1965 or earlier | | | |
| Monoophorum sp. Bush, 1974 | 1964 or earlier | | | common on Ulva |
| Plagiostomum sp. Boaden, 1963 | 1964 or earlier | | | |
| Bdelloura sp. Bush, 1964 | 1964 or earlier | | | probably Bdelloura candida. |
| Monocelis sp. Ferguson & Jones, 1949 | 1964 or earlier | | | |
| Gyratrix sp. Bush, 1964 | 1964 or earlier | | | |
| Hoploplana inquilina (Wheeler, 1894) | prior to 1939 | | | inhabiting the mantle cavity of the large gasteropod Sycotypus |
| Eurylepta maculosa Verrill, 1893 | Aug 2, 1882 | low tide | piles, mud, algae | uncommon. |
| Phagocata woodworthi Hyman, 1937 | 1900 or earlier | | | |
| Phagocata woodworthi Hyman, 1937 | 1900 or earlier | | | |
| Phagocata woodworthi Hyman, 1937 | 1913 or earlier | | | |
| Graffilla gemellipara Linton, 1910 | 1909 | | | collected on the gills of Modiolus gemellipara, the ribbed mussle in summer of 1909 [see Bush cards for species and reference records]. |
| Graffilla gemellipara Linton, 1910 | 1913 or earlier | | | In Modiolus plicatulus and ? Mytilus edulis, |
| Solenopharynx flavidus Graff, 1882 | 1938 or earlier | | | 1 specimen. |
| Sopharynx oculatus (Pereyaslawzewa, 1892) | 1938 or earlier | | | 1 specimen. |
| Monocelis fusca Örsted, 1843 | 1913 or earlier | | | |
| Monocelis wilhelmii Graff, 1911 | 1911 or earlier | | | |