| Discocelis japonica Yeri & Kaburaki, 1918 | Apr 1937 | | | Very common at Edura, Skatahana, Tosima and Yuzaki. |
| Bergendalia mirabilis Kato, 1938 | Apr 1937 | | | single specimen taken at Yuzaki under a stone slightly embedded in the sand near the low tidemark. |
| Notoplana japonica Kato, 1937 | Apr 1937 | | | five specimens collected at Yuzaki. |
| Callioplana marginata Stimpson, 1857 | Apr 1937 | | | found in abundance at Yuzaki and at Tubaki near Seto. |
| Pseudostylochus maculatus Kato, 1938 | Apr 1937 | | | single specimen collected at Yuzaki. |
| Cestoplana rubrocincta (Grube, 1840) | Apr 1937 | | | common at Yuzaki and Edura. |
| Pseudoceros atropurpureus Kato, 1934 | Apr 1937 | | | very common at Yuzaki. |
| Cycloporus papillosus (1) misakiensis Kato, 1938 | Apr 1937 | | | collected under a stone near the low tidemark at Yuzaki. |
| Chromoplana bella Bock, 1922 | Apr 1937 | | | under stones between the tidemarks. |
| Prosthiostomum marmoratum Yeri & Kaburaki, 1918 | Apr 1937 | | | numerous specimens of this species were collected at Yuzaki. |
| Prosthiostomum auratum Kato, 1937 | Apr 1937 | | | numerous specimens obtained under stones at Yuzaki and Sakatahana. |
| Prosthiostomum vulgaris Kato, 1938 | Apr 1937 | | | numerous specimens collected at Yuzaki. |