PLEISTOCENE GEOLOGY OF THE THAMES VALLEY. 349
fangs. The latter, since the present specimen belonged to a
young individual, are small and only partly developed. Mr.
J. P. Johnson has in his collection two teeth of M. glareolus
which he has kindly allowed us to examine. Both specimens
are first left lower molars and both have two well developed
fangs, the anterior of which are the larger. They each present
four outer and four inner angles or prisms differing, therefore,
from Blasius' typical form which has five internal angles. They
thus more nearly resemble the form figured by Blasius (op. cit.)
in his figure 180 in which the fifth or anterior inner prism is
merged in the one just behind.
M. glareolus has not previously been recorded from the Drift
of the Thames Valley, but is known from other Pleistocene
beds. It has also been found in the Norfolk Forest Bed.
Mus sylvaticus. Mr. J. P. Johnson has obtained from
the Orsett Road Section a small fragment of a right rodentian
ramus carrying the anterior molar. The latter agrees in size
with the corresponding tooth of M. sylvaticus, and also in the
number and arrangement of the tubercles. It differs likewise
from M. lewisii in having a small anterior accessory cusp, which
in the latter species is absent. The specimen is, therefore,
placed with M. sylvaticus without doubt.
This species forms a new record for the Pleistocene deposits
of the Thames Valley. It has been obtained from the Ightham
Ossiferous Fissures and also from the Norfolk Forest Bed.
Sorex vulgaris. Remains of the Shrew have long been
known from Grays. Three specimens presented by John Brown,
of Stanway, are in the British Museum (Natural History). The
specimens from the Orsett Road Section have been carefully
compared with recent skeletons of Sorex vulgaris, and agreeing as
they do in every respect with the Common Shrew we have little
hesitation in referring them to this species. This form has been
met with in ether beds of Pleistocene age and also in the Norfolk
Forest Bed.
AVES.
(a.) List of Species.
Anser cinereus, Meyer.
Cygnus musicus, Bechstein.
Phalocrocorax carbo, Linné,