A COLLECTION OF OPISTHOBRANCH MOLLUSKS FROM THE PITCAIRN-ISLANDS

Opisthobranch molluscs collected during the Sir Peter Scott Commemorat ive Expedition to the Pitcairn Islands (1991-2) are described. Twenty taxa were discovered from the four islands that form the group, and a further two species had been found during earlier work. The records of Phyllobranchillus orientalis and Peltodoris fellowsi represent consid erable extensions to their known ranges. A large dendrodorid, provisio nally referred to Dendrodoris tuberculosa, appears to represent the la rgest known specimen from this family. One new species (Bornella irvin gi) from Ducie Atoll is described here for the first time.