50
THE ESSEX NATURALIST
Phylum CHAETACNATHA
Sagitta elegans Verrill
Rare in the plankton during May 1963.
Sagitta setosa J. Muller
Rare in the plankton during 1962 and 1963.
Phylum KAMPTOZOA (POLYZOA ENTOPROCTA)
Pedicellinidae
Pedicellina sp.
Frequently seen on hydroid colonies dredged from Thirslet
Creek and adjacent areas with clean shelly bottoms.
Phylum POLYZOA s. star.
Order Cyclostomata
DlASTOPORIDAE
Diastopora patina (Lamarck)
Dredged in the Blackwater, 25.5.1961.
Order Gymnolaemata
Membraniporidae
Membranipora membranacea (Linne)
Common and widely distributed on clean shelly bottoms. En-
crusting on shells and stones. Records probably include other
species in the family.
Membranipora monostachys (Busk)
Dredged in the Blackwater, 25.5.1961.
Electra pilosa (Linne)
Common on holdfasts of Laminaria and other large algae
occurring at or below low water mark. Also obtained from the
shells of Mytilus edulis in fouling on ships (5.1960).
Conopeum reticulum (Linne)
Dredged from the Blackwater, 25.5.1961.
Amphiblestrum flemingi (Busk)
Dredged from the Blackwater, 25.5.1961.
Flustridae
Flustra foliacea (Linne)
Common and widely distributed on bottoms of shells and
stone, mostly below low water mark but also on the lower shore.
Occurs from off Osea Island seawards.
Scrupocellariidae
Scrupocellaria scruposa (Linne)
Common, attached to shells and on Flustra and tunicates.
Occurs in all parts of the area seawards of Osea Island at, or
below, low water mark.