2 CARIDEAN SHRIMPS OF THE FAMILIES BRESILIIDAE AND HIPPOLYTIDAE FROM A HYDROTHERMAL FIELD ON THE IHEYA-RIDGE, OFF THE RYUKYU-ISLANDS, JAPAN

Twenty-six specimens representing 2 genera, Alvinocaris of the family Bresiliidae and Lebbeus of the Hippolytidae, were found in samples col lected from hydrothermal fields in the Okinawa Trough, Japan. Twenty-o ne specimens are described as Alvinocaris longirostris, new species, a nd the remaining 5 are redescribed as a very rare bathyal shrimp, Lebb eus washingtonianus (Rathbun, 1902).