The adults of three new cyclopoid copepods are described and figured, namely Micropontius ovoides, gen. et sp.nov., occurring on spatangid echinoids; Lichomolgus leptodermatus, sp.nov., and Conchyliurus cardii, sp.nov., both associated with pelecypod molluscs. Micropontius is made the type of a new family, the Micropontiidae.
Some other copepods, Asterocheres violaceus (Claus), Scottomyzon gibberum (T. & A. Scott), Pseudanthessius liber (Brady & Robertson), Bomolochus confusus Stock, Euryte longicauda Philippi var. minor T. Scott and Peniculus fistula Nordmann, are recorded for the first time from the Plymouth region; and mention is also made of Tisbe elongata (A. Scott).
Points of interest in the biology, morphology, systematics and distribution of all these are discussed.