THE MARINE FAUNA OF THE BLACKWATER ESTUARY 17
Phylum COELENTERATA
Class HYDROZOA
Order Hydroida
TUBULARIIDAE
Tubularia indivisa Linne.
Not common; mainly found in the shingle areas of the Colne
Bar and Eagle. Tubes attached to shells of Modiolus and stones
(Colne Bar, 24.5.1962). Bradwell Power Station water intake
culvert (1964 and 1965).
Tubularia larynx Ellis & Solander
Not common; found on stations TL.2, TL.4, Line 1.3, and off-
shore in 1960 and 1962. Bradwell Power Station water intake
culvert (1964).
BOUGAINVILLIIDAE
Bougainvillia ramosa (van Beneden)
One record only; from Bradwell Creek (1961), but may be
common.
Campanulariidae
Obelia dichotoma (Linne)
Fairly common in Bradwell Creek and along the shore at
Bradwell (1960-65), but probably common elsewhere. Attached
to shells, etc.
Obelia longissima (Pallas)
One record only from the shore at Bradwell.
Laomedia flexuosa Hincks
Occasional records, specimens attached to shells; Bradwell
Creek and station S.14 (1960) and Eagle (25.5.1962).
Sertulariidae
Dynamena pumila (Linne)
Common and widely distributed, mostly in association with
other hydroids and attached to algae. Lower shore and below
low-water mark.
Sertularella polyzonias (Linne)
Only a few identifications made. Station S.7 (1960). May be
common.
Sertularella sp.
Common on clean shelly bottoms. No specific identifications
were made from routine bottom samples but S. polyzonias is most
likely included.
Abietinaria abietina (Linne)
Occasional, with other hydroids on shelly bottoms. Station
HB.2 (1960).