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THE ENTOMOSTRACA OF EPPING FOREST.
Faunas of some well-known Forest ponds, &c.
The full lists of species from the principal ponds in the
Epping Forest district are given in Table I., but it will probably
be useful also to point out the peculiarities exhibited by these
and some other typical collecting stations.
Wanstead Park Ponds. Three of the four principal
ponds in Wanstead Park—namely, the "Heronry" pond,
the "Lake," and the "Shoulder of Mutton" pond, are very
similar in general character. They are very shallow, with
abundant aquatic vegetation, which not only occurs near
their margins, but often extends well out from the shore. The
"Perch" pond is of rather a different type, being slightly
deeper than the others, at least at its eastern end, and its
aquatic vegetation is closely confined to the margins. Each of
the four ponds shows a very good list of Entomostraca, most of
the species being common to all, but the "Perch" pond is distin-
guished from the others by the presence of the hyaline Daphnias
(D. hyalina, D. galeata ?, and D. cucullata ?), Camptocerens rectirostris,
and Pteuroxus uncinatus, and by the absence of Daphnia pulex,
Cyclops strenuus and C. bicuspidatus. The distinguishing species
of the "Lake" are Cypria exsculpta and Diaptomus vulgaris, of
the "Shoulder of Mutton" pond, Sida crystallina, Leydigia
quadrangularis, and Ilyocypris gibba. One of the smaller ponds
of the Park (now filled up) yielded Diaptomus castor, and the
swamp between the "Perch" pond and the "Lake" is the
only spot where Canthocamptus zschohkei has been taken in the
district.
On the whole, Wanstead Park is certainly the richest
collecting ground for Entomostraca within the Epping Forest
area.