THE MARINE FAUNA OF THE BLACKWATER ESTUARY 23
Cirratulus Cirratulus (0. F. Muller)
One record from Bradwell Creek.
Cirratulus filiformis Keferstein
Bradwell shore September 1959, February and July 1961.
Heterocirrus sp.
Bradwell shore; September 1958.
Chlorhaemidae
Flabelligera affinis Sars
Commonly dredged at Thirslet, among sponges on clean shell
and stones and also from similar bottoms in the Colne Bar area
(24.5.1962).
Flabelligera diplochaitos Hasse
Occasionally found with F. affinis.
Stylarioides monilifer Delia Chiaje
Rare in 1960 but becoming commoner in 1965, being widely
distributed on bottoms of mud and shell. Specimens were also
collected from the Power Station intake culvert in 1964.
SCALIBREGMIDAE
Scalibregma inflatum Rathke
One specimen from the Bradwell shore in October 1960.
Opheliidae
Ophelia sp.
Bradwell shore, January 1960 and February 1961.
CAPITELLIDAE
Some capitellids were collected from Bradwell Creek but no
full identifications have been made.
Arenicolidae
Arenicola marina Linne Lugworm
Commonly occurring in mud and sand in the littoral zone.
Bradwell shore and Mersea Flats, 1961-63.
Maldanidae
Clymene oerstedii Claparede
Common in grab samples from bottoms of mud and sandy
mud. Line 2a.St.4 (10.9.1960).
Sabellariidae
Sabellaria spinulosa Leuckart
Common on bottoms of stone and shell where there is little
mud. Particularly found forming characteristic sand tubes over
old shells or 'culch' on mid-river stations: C.1 to C.8, and on
stones in the Colne Bar-Eagle areas where it makes up the type
of bottom known locally as 'ross'. S. alveolata may also be pre-
sent, particularly in off-shore areas.