A new hermit crab of the genus Calcinus from Microoesia, including new information on C-revi (Decapoda : Anomura : Diogenidae)

Calcinus kurozumii new species, is described and illustrated based on speci mens from the northern Mariana Islands. Micronesia. It is a member of the g roup in which the dactyls and propodi of the third pereiopods have dense br ush-like setae on the ventral face. The new species is distinguished from o ther Indo-West Pacific species of the group by the armature of the left che liped. The new species is compared with a similar species from Polynesia, C . revi Poupin and Mclaughlin, 1998. Calcinus revi is rediagnosed based on n ew material from the Izu-Ogasawara-Mariana Are, and growth-related morpholo gical variations and color are reported. A key to the Indo-West Pacific spe cies of Calcinus with the brush of setae is provided.