26
THE ESSEX NATURALIST
Class COPEPODA
Order Eucopepoda
Calanidae
Calamus finmarchicus (Gunnerus)
Two adults and three copepodites were recorded from samples
of the Blackwater plankton. The species is more common sea-
wards of the Knoll and is generally found in some numbers at the
Barrow Deeps light vessel (1960 and 1961).
PARACALANIDAE
Paracalanus parvus (Claus)
Rare in the Blackwater. Collected in plankton samples from
the area of the Barrier Wall at Bradwell in August and November
1962 and in February and September 1963.
PSEUDOCALANIDAE
Pseudocalanus elongatus Boeck
Rare in the Blackwater. Occurring in the area of the Barrier
Wall at Bradwell in March, April and December 1962, and
generally throughout 1963.
Centropagidae
Centropages hamatus (Lilljeborg)
Not common in the Blackwater plankton. Occurred from
April to November, with a peak in August 1962 and from June to
November, with a peak in July-August in 1963.
Isias clavipes Boeck
Of rare occurrence in the Blackwater plankton.
Temoridae
Temora longicornis (O. F. Muller)
Occurring in plankton samples taken at the Barrier Wall,
Bradwell, April to December, with a peak in June 1962, and
April to November, with a peak in April-May 1963.
Eurytemora hirundoides (Nordqvist)
Two records only from plankton samples taken at the Barrier
Wall, Bradwell; December 1962 and May 1963.
Pontellidae
Labidocera wollastoni (Lubbock)
One only, recorded from a plankton sample taken in the area
of the Barrier Wall at Bradwell on 13.6.1960.
Parapontellidae
Parapontella brevicornis (Lubbock)
Rare in the Blackwater plankton; July and September 1962
and in 1963.