350 PLEISTOCENE GEOLOGY OF THE THAMES VALLEY.
(b.) Notes on Species.
Anser cinereus. This species is represented by a left
femur preserved in the British Museum. The genus Anser is
known from the "Forest Bed" series of West Runton. Bones
of the goose have likewise been obtained from the Pleistocene
deposits of Ilford and Crayford in the Thames Valley.
Cygnus musicus. In the British Museum is preserved
the "distal portion of a tibio-tarsus not improbably belonging to
this species." Many years ago Sir Richard Owen described and
figured this specimen, and he presented it to the national
collection. The proximal end of a radius in all probability refer-
able to this species is in the same collection.
Phalocrocorax carbo. A left ulna bearing the number
36633 in the British Museum Catalogue is therein referred to
Anser cinereus (p. 103). The specimen, however, bears the label
P. carbo, and believing this to be the correct reference we have
listed it as such. The Cormorant is known from the "Forest
Bed" series of West Runton.
REPTILIA.
Tropidonatus natrix. Among the fossils which we have
obtained from the Orsett Road Section is a thoracic vertebra of a
reptile. This specimen agrees very closely with those of the
recent Grass-snake to which species we accordingly refer it,
but we avoid minutely describing it until we have made a more
extended comparison with recent examples both of this species
and the Viper. The Grass-snake is known from the "Forest
Bed" series and from the Ightham Fissure. It has not,
however, been previously recorded from the Pleistocene deposits
of the Thames Valley.
AMPHIBIA.
(a.) List of Species.
Rana temporaria, Linné.
Bufo vulgaris, Linné.
(b.) Notes ou Species.
Rana temporaria. We have obtained from the Orsett
Road Section a fairly large series of bones representing the
Amphibia, many of which are referable to Rana. Among the
latter a left ilium and the distal portions of three male humeri,