542 A. R. Horwood—Post- Pleistocene of Central England. 
that there were two such beds, and therefore identified the Upper 
Ostrea-Bed of one working with the Lower of the other. 
As regards the Freestone-Beds, there is general agreement between 
the present record and that given by Mr. Woodward. 
In 1906 the Cotteswold Naturalists’ Field Club saw Groves’ Quarry, 
and it was remarked that the beds were less massive than those of 
the Great Oolite that were quarried in the neighbourhood of Bath.? 
It is not purposed attempting any detailed correlations of the beds 
in this section with those elsewhere. The time is not ripe; but it 
may be as well to draw particular attention to the following points :— 
(1) The somewhat abundant occurrence of specimens of Anabacia 
complanata (Defrance) in bed 2, and the presence of the echinoids, 
Echinobrissus woodwardi, Wr., and Clypeus milleri, Wr. 
(2) The very fossiliferous nature of bed 6, all the fossils being 
noteworthy for correlation-purposes. 
(3) The relative barrenness of the marl-beds associated with the 
fossiliferous top-limestones. 
(4) The distinctive lithic structure of bed 14 and its richness in 
specimens of Cypricardia spp. and Volsella imbricata (Sow.), and to 
a less extent in certain other Lamellibranchs. 
(5) The not infrequent occurrence of Placunopsis socialis, M. & L., 
in bed 15d. 
(6) The occurrence of two conspicuous Ostrea-Beds (15d and 17), 
7ft. 4in. apart. The oysters in the lower bed are usually encrusted 
with Serpula tricarinata, Sow., Berenicea spp., occasionally with 
Webbina, and are frequently pierced by the boring sponge Zadpina. 
IV.—Tue Postr-Puietsrocenr Frora anp Fauna or CenrraL ENGLAND. 
By A. R. Horwoop, 
Leicester Museum. 
ee central position of Leicestershire gives it not only a peculiar 
relationship in regard to river-drainage, streams radiating from 
its plateau-frontier on the one hand to the north, flowing into the 
Humber, and on the other to the south into the Bristol Channel, 
separated alone by a now comparatively insignificant divide in the 
neighbourhood of Lutterworth. Also the very fact that this divide 
is given, by the otherwise lowland character of the tract to the 
north and south, a barrier-like aspect, renders it highly probable that 
the flora and fauna in this basin-like area is more or less homogeneous. 
That it has been uniform in character, no doubt from pre-Glacial 
times, when doubtless the existing drainage systems (though probably 
still more ancient fundamentally) received their most recent stamp, 
having been little modified (except in depth or width) during Glacial 
or later times. For this purpose we must needs summarize all that 
is known as to the occurrence of plants or land and freshwater Mollusca 
in post-Pleistocene alluvial deposits. 
\ The Jurassie Rocks of Britain—The Lower Oolitic Rocks of England (Yorkshire 
excepted), vol. iv (1894), p. 307. 
* Proc. Cotteswold Nat. F.C., vol. xvi, pt.i, p. 32, 1907; see also Geology in the 
Field (Jubilee vol. of the Geol. Assoc.), pt. 2, p. 356, January, 1910. 
