Plehnia pacifica Kato, 1939 | Jul 19, 1935 | 28 m | | single Craspedommatous polyclad brought up by dredger off west coast of Tako-sima near Onagawa. |
Notoplana libera Kato, 1939 | Aug 14, 1935 | | | Two specimens of this new species were collected at Takenoura. |
Notoplana sophia Kato, 1939 | Nov 25, 1936 | | | two examples which were found on the wooden floats of a gill-net at Konorihama. |
Notoplana humilis (Stimpson, 1857) | 1935-1937 | | | very common on a sandy beach in the vicinity of the Institute [Onagawa Oceano-chemical Institute of the Tohoku Imperial University from Onagawa Bay] |
Pseudostylochus nationalis Kato, 1939 | Jun 25, 1938 | | | a single specimen at Konorihama. |
Pseudostylochus obscurus (Stimpson, 1857) | Jul 16, 1935 | | | several specimens at Konorihama and Isihama. |
Pseudostylochus takeshitai Yeri & Kaburaki, 1918 | Jun 25, 1938 | | | three specimens collected under stones at Konorihama. |
Pseudostylochus aino Kato, 1937 | Jul 18, 1935 | 8.4 m | | two were dredged from a depth of 8.4 m at Mamakohama. |
Pseudostylochus edurus Kato, 1938 | Jun 25, 1938 | | | under a stone at Konorihama. |
Pseudoceros sagamianus Kato, 1937 | Oct 16, 1935 | | | on a submerged slate at Konorihama. |
Prosthiostomum bellum Kato, 1939 | Jul 31, 1935 | | | three individuals collected at Mamakohama. |
Pseudoceros sagamianus Kato, 1937 | 1944 or earlier | | | |
Prosthiostomum bellum Kato, 1939 | 1944 or earlier | | | Mamakohama near Onagawa, Rikuzen. A single specimen. |