Genus Limaria Link, 1807

Limaria sp. indet.

Figures 260-264

1992. Limaria sp., Kase and Hayami, Jour. Moll. Studies, vol.58, p.448, listed.

This species is represented by a few living specimens from "Cross Hole" (RM19511) in addition to many dead specimens from "Fool's Palace" (RM19508), "Black Hole" (RM19509) and "L-arch" (RM19510) of Shimoji-Irabu Islets, and also from "Shodokutsu" (RM19512) of Ie Islet.

The shell is small (though adult size cannot be estimated at present), opisthocline, translucent and very thin. The surface is nearly smooth except for about 30 irregular weak radial threads and faint Camptonectes-stnae. The Pd I is moderate in size, ranging 84-114 µm in maximum diameter, and the Pd II, ranging 258-281 µm, is also discriminated.

This species is certainly a member of Limaria, and the weak radial sculpture suggests its subgenus Limatulella Sacco, 1898. Limaria (Limatulella) kawamurai Masahito and Habe, 1972, from Tosa Bay of Shikoku has a similar outline and sculpture, but is much larger than the present species. We cannot yet determine whether this is an indigenous species to cryptic environments or represents only some juvenile stage of a non-cryptic species.

It also occurs in "Balicasag Cave" of Bohol Island, the Philippines.