| Hofstenia atroviridis Bock, 1923 | Jun, Jul 1914 | shallow, surf zone | | Exposed coast. Slow acting animal found in shallows of ebbing tide, in tide pools, and at greater depth between Laminaria roots. Found between Corallina- Bestaenden. |
| Neostylochus fulvopunctatus Yeri & Kaburaki, 1920 | prior to 1920 | intertidal | | |
| Otocelis rubropunctata (Schmidt, 1852) | prior to 2004 | | | |
| Amphiscolops sp. Steinbock, 1938 | prior to 1965 | | | |
| Convoluta sp. Sabussow, 1897 | prior to 1965 | | | |
| Paramecynostomum diversicolor (Ørsted, 1845) | prior to 2004 | | | |
| Vorticeros lobatum Tozawa, 1918 | 1918 or earlier | | | |
| Vorticeros ijima Tozawa, 1918 | 1918 or earlier | | | |
| Leptostylochus ovatus Kato, 1937 | Sep 25, 1930 | | | single specimen obtained from the undersurface of stone between tidemarks at Araibama. |
| Discostylochus yatsui Kato, 1937 | May 15, 1933 | | | collected on the underside of stone in the tidal zone at Araibama. |
| Cryptophallus eximius Kato, 1937 | Jul 26, 1930 | | | single specimen collected under the stone near the low tidemark at Bentensita. |
| Stylochoplana clara Kato, 1937 | 1930-1936 | | | species is commonly found living on Zostera and Phyllospadix all year round. |
| Paraplanocera rubrifasciata Kato, 1937 | Sep 9, 1932 | 27.4 m | | single specimen dredged from a depth of 15 fathoms off Hutamatiya. |
| Pseudoceros sagamianus Kato, 1937 | Apr 6, 1935 | | | single specimen collected at Bentensita. |
| Prosthiostomum auratum Kato, 1937 | Aug 28, 1936 | | | found creeping on Phyllospadix. |
| Prosthiostomum purum Kato, 1937 | 1932 | 27.4 m | | six specimens collected in the autumn from a depth of 15 fathoms off Hutamatiya. |
| Prosthiostomum yerii Kato, 1937 | Sep 7, 1932 | 27.4 m | | one specimen from a depth of 15 fathoms off Hutamatiya. |
| Discocelis japonica Yeri & Kaburaki, 1918 | 1937 or earlier | | | |
| Stylochoplana pusilla Bock, 1924 | 1938 | | | This species is a small parasitic form, found in the mantle cavity of Monodonta labio. Also harbours in the mantle cavity of Cellana toreuma. |
| Pseudostylochus takeshitai Yeri & Kaburaki, 1918 | 1938 or earlier | | | |
| Planocera reticulata (Stimpson, 1855) | 1932-1933 | | | found in abundance in this district and Misaki all the year round; multi-tenticular forms often occur. |
| Discocelis fulva (Kato, 1944) | 1944 or earlier | | | Misaki; Susaki. Common under stones between tidemarks in summer. |
| Stylochus ijimai Yeri & Kaburaki, 1918 | 1944 or earlier | | | Misaki. |
| Leptostylochus gracilis Kato, 1934 | 1944 or earlier | | | |
| Cryptocelis ijimai Bock, 1923 | 1944 or earlier | | | |
| Notoplana delicata (Yeri & Kaburaki, 1918) | 1944 or earlier | | | |
| Notoplana japonica Kato, 1937 | 1944 or earlier | | | |
| Discoplana takewakii Kato, 1935 | 1944 or earlier | | | |
| Zygantroplana clepeasta Kato, 1944 | 1938 | | | two specimens found on Clepeaster japonicus Döderlein by Dr. K. Takewaki in the summer of 1938. |
| Hoploplana ornata Yeri & Kaburaki, 1918 | 1944 or earlier | | | Misaki. |
| Planocera purpurea Yeri & Kaburaki, 1918 | 1944 or earlier | | | |
| Planocera profunda Kato, 1937 | 1944 or earlier | 32-36 m | | |
| Planocera multitentaculata Kato, 1940 | 1944 or earlier | | | Usually found together with Planocera reticulata. |
| Paraplanocera oligoglena (Schmarda, 1859) | 1944 or earlier | | | |
| Callioplana marginata Stimpson, 1857 | 1944 or earlier | | | |
| Pseudostylochus obscurus (Stimpson, 1857) | 1944 or earlier | | | |
| Pseudostylochus fulvus Yeri & Kaburaki, 1918 | 1944 or earlier | | | |
| Thysanozoon brocchii (Risso, 1818) | 1944 or earlier | | | |
| Thysanozoon vulgaris Palombi, 1939 | 1944 or earlier | | | |
| Pseudoceros flavomarginatus Laidlaw, 1902 | 1944 or earlier | | | |
| Pseudoceros reticulatus Yeri & Kaburaki, 1918 | 1944 or earlier | | | |
| Pseudoceros gratus Kato, 1937 | 1944 or earlier | | | |
| Pseudoceros sagamianus Kato, 1937 | 1944 or earlier | | | |
| Pseudoceros nipponicus Kato, 1944 | 1944 or earlier | | | Misaki. |
| Cycloporus japonicus Kato, 1944 | 1944 or earlier | | | commonly found on compound ascidians. |
| Chromoplana bella Bock, 1922 | 1944 or earlier | | | |
| Amyella lineata Bock, 1922 | 1944 or earlier | | | |
| Prosthiostomum rubropunctatum Yeri & Kaburaki, 1918 | 1944 or earlier | | | |
| Prosthiostomum ostreae Kato, 1937 | 1944 or earlier | | | found on cultivated oyster-shells. |