THE ENTOMOSTRACA OF EPPING FOREST.
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complete local list of British Fresh-water Entomostraca yet
published. It considerably exceeds Mr. T. Scott's list of 85
species of fresh-water Entomostraca from the district around
Edinburgh (68), which has hitherto held the first place in
this respect. In the paper on the Wanstead Park Entomos-
traca a comparison was made between the number of species
recorded in each Order, and the total number then known
to be British. During the period of five years that has
elapsed, a very considerable number of additions have been
made to the recorded British Entomostracan fauna, more
especially to the Copepoda by Messrs. T. and A. Scott. It
may prove interesting to repeat the figures previously given,
and to make a similar comparison of the number herein
recorded from Epping Forest with those now known to
inhabit the fresh waters of the British Isles. This is done
in the following statement: —
Species recorded for first time as British.
The list now published contains three species, and one
variety, new to the British fauna—namely, Ceriodaphnia scitula
Henrick, Diaptomus vulgaris Schmeil (=D. coeruleus Fischer),
Cyclops bistriatus Koch, and a variety of Acropems harpae Baird.
A few remarks on each of these will be given in the detailed
notes on the species.
In addition to the foregoing, a good many species appear
in the Epping Forest list, which, although already placed
upon record as British, were found for the first time during
the examination of the district. Some of these are Cerioda-
phnia megalops, C. quadrangula, Chydorus latus, Candona pubescens,
Cyclops leuckarti, C. oithonoides, C. dybowskii, C. languidus, C.
bicolor, &c.
Periodicity of certain species.
The facts obtained relating to the periodicity of a number
of species, during the investigation into the Wanstead Park
Entomostracan fauna, have been in the main very closely
3 This includes live species of parasitic Copepoda which were not taken into
account in the Wanstead Park paper.