抄録
The porcellanid crabs Polyonyx sinensis and P. utinomii were collected from tidal flats in Uranouchi Inlet, Kochi Prefecture, Japan. The crabs were collected from the tubes of the chaetoptend polychaerus; P. sinensis was symbiotic with Mesochaetoperus japonicus and P. uhinomii with Chaetopterus cautus.
