Zooid polymorphism in the hydrozoan species Stylactaria misakiensis (Hydractiniidae) includes tentaculozooids, in addition to gastrozooids and gonozooids. Laboratory experiments demonstrated that differentiation of such tentaculozooids was induced in response to stolon contact between the former and Leuckartiara sp. (Pandeidae) during interspecific competition for living space.

Of 14 crab species recently collected from shallow water of Suruga Bay, Pacific coast of central Japan, the following 7 species are studied in detail: Leucosia rubripalma Galil, 2003 (Leucosiidae), Thranita cerasma (Wee and Ng, 1995) and Trionectes mariei (Guinot, 1957) (Portunidae), Pilodius miersi (Ward, 1936) (Xanthidae), Actumnus elegans (De Man, 1887) and Zehntneriana amakusae (Takeda and Miyake, 1969) (Pilumnidae), and Notonyx sagittifer Ng and Clark, 2010 (Goneplacidae). Of these 7 species, N. sagittifer is new to Japanese waters, and the remaining 5 species other than L. rubripalma which has been reported from Suruga Bay as L. perlata De Haan, 1841, are new to Suruga Bay.

A new species of the genus Tegecoelotes, from Nara pref., Honshu, Japan, is described under the name of Tegecoelotes spathaceus n. sp. The new species can be easily distinguished from all other congeneric species by its broad sword-shaped conductor and large conductor dorsal apophysis in the male palp.