216
THE NON-MARINE MOLLUSCA OF THE
WALTON CRAG.
By A. S. KENNARD and B. B. WOODWARD, F.L.S, F.G.S., &c.
IT is indeed a matter of congratulation that the small patch of
Red Crag at Walton has been preserved for the geologist's
pick, and has not shared the fate of the adjoining patch at
Harwich which is now a thing of the past. At the same time
it must be pointed out that the Walton Crag is of much larger
extent than is commonly supposed ; and Mr. F. W. Harmer has
recently obtained a fine series of shells from Little Oakley.
Unfortunately our present knowledge of the Pliocene Molluscan
Fauna is by no means perfect. The nomenclature is in an
almost hopeless condition : collections have been dispersed,
several "types" cannot now be traced, and it is greatly to be
desired that some competent person will endeavour to place on
a more satisfactory basis our knowledge of the fauna of the
Crags. As a slight contribution to this end we have ventured
to revise the Non-Marine Mollusca, and this was published last
year.1
Thinking, however, that an account of the Non-Marine
fauna of the Walton Crag would be of interest to all Essex
naturalists, we offer the present note.
Six species in all have been recorded from the Walton
Crag :—
1. Pyramidula rysa. (S. V. Wood.)
Helix ripa, S. V. Wood; Crag Moll., vol. i., p. 4, pl. i., fig. 1 ; Helix
rufescens, Penn., var. ?; J. G. Jeffreys, Quart. Jour. Geol. Soc., vol.
xxvii. (1871), p. 493 ; Patula (Janulus) rysa, S. V. Wood; C.L.F.
Sandberger, Land & Sussw Conch. Vorwelt., p. 737.
Only one example of this species has been found at Walton,
and this was obtained by Mr. G. S. Gibson from inside the
mouth of an example of Buccinum undatum, Linn. It is the type
of the species, and is now preserved in the Saffron Walden
Museum. Only one other example is known, and this was
obtained from the coprolite diggers at Waldringfield by Mr.
Canham, and is now in the Ipswich Museum. Its nearest allies
are apparently Pyramidula Calathus (Lowe) and P. bifrons (Lowe)
from Madeira, and it may be referred with these to Lowe's
section Janulus,
1 "A Revision of the Pliocene Non-Marine Mollusca of England" By A. S. Kennard
and B, B. Woodward, F.L.S. Proc, Malac. Soc., vol. iii., pp. 187-204.