80 THE NON-MARINE MOLLUSCS OF ESSEX.
Pisidium fontinale, Draparnaud.
A.—River Stort; (Ingold) : Canning Town ; (K. and W.) : Ilford ;
Walthamstow ; (British Museum) : Docks; Grays;
(British Museum).
B.—River Chelmer, Felstead ; (French) : *River Colne, near
Colchester ; (Laver) : River Cann, Chelmsford ;
(W.M.W.): [Felstead; (French)]: Raine; Copford; Clacton;
Braintree; (British Museum) : *Chignal; (Christy, 3).
C.—River Stour ; (King).
Pisidium milium, Held (=roseum, Scholtz).
A.—Lea Marshes; (E. H. Row, Naturalist's World, 1885).
SUMMARY.
It will be seen from the from the foregoing list that, taken
as a whole, the recent molluscan fauna of Essex is rich in
number of species. The shells of many species also which
have not been recorded as living in the County, but which have
not yet disappeared from the British Isles, are to be found
fossil in the various Post-pliocene deposits that are a feature
of Essex. Again, in these same deposits, six out of the seven
extinct British species have been discovered ; that is all except
Clausilia pumila.
It is probable that several species not hitherto recorded for
Essex will, from time to time, be added to the list, and that
further work will show a more general distribution of some
forms over the County. The Slugs still require a considerable
amount of attention, while little collecting has been done in
several large districts. A general discussion on distribution or
a comparison of the past and present faunas can hardly be
entered upon here, and may form the subject of a future paper.
For notes on some of the individual species the reader is
referred to Messrs. Kennard and Woodward's paper "On the
Post-Pliocene Non-Marine Mollusca of Essex" in the present
number of the Essex Naturalist ; while a brief statement as
to the number of forms not found living or fossil (as the case
may be) is appended to the table which accompanies the last
mentioned paper.
In the following table § the number of species occurring in
the various provinces and the whole county are compared with
one another and with the general list for the British Isles : —
§ The additions are included : two species (Oncidiella celtica and
Azeca elongata) having been considered as British, make the apparent dis-
crepancy between the 138 species given by Messrs. Woodward and Kennard
for the British Isles and the 140 set down in the table.