THE ENTOMOSTRACA OF EPPING FOREST. 317
Family—Bosminidae.
Bosmina longirostris, O. F. Muller.—? Baird (2),
Norman and Brady (56).
Bosmina cornuta, Jurine. — This has only been
previously noted as British in the lists of species published in
the Journal of the Quekett Micro. Club (57). It is very closely
related to D. longirostris, but in its typical form the antennules
are rather short, recurved and divergent, while the two shell-
spines are reduced to mere knobs. Stingelin (104) has remarked,
however, that this species is subject to great seasonal variation.
Family—Lyncodaphnidae.
Macrothrix laticornis, Jurine.—Baird (2), Norman and
Brady (56).
Macrothrix hirsuticornis, Norman and Brady (56).
Without doubt this is one of the best records in the whole list
of Epping Forest Entomostraca. Since the species was
first described in 1867, it appears to have been only once again
recorded in the British Isles (79, Part II.), and on the Continent
it has only been found by a few observers. It is a fine species,
being in fact the largest of the genus. Numerous specimens
were taken in Connaught Water on the 10th March, 1894, but
curiously enough none could be found about a month later, nor
has the species been seen again.
Ilyocryptus sordidus, Lievin.—A cantholeberis sordidus,
Norman (55); I. sordidus, Norman and Brady (56), Bolton (6).
Family—Lynceidae.
Eurycercus lamellatus, (3. F. Muller. — Baird (2),
Norman and Brady (56).
Acroperus harpae, Baird.—Baird (2); Lynceus harpae,
Norman and Brady (56). Figures of the typical form of this
species and of the variety already referred to in Part II. are given
in the accompanying illustration. From these it will be
seen that the variety differs mainly from the type by its larger
size and the very much greater development of the head.
It seems to me very probable that this variety is the same
as the form described by Koch (96) as Lynceus leucocephalus,