BIVALVIA. 163 
Mya rruncata, Linn. Crag Moll., vol. ui, p. 277, Tab. XXVIII, fig. 1. 
Localities. Cor. Crag passim. Red Crag passim. Fluvio-marine Crag, Bramerton. 
Chillesford bed, Chillesford and Sudbourn Church Walks. Lower Glacial, Weybourn 
and Runton. Middle Glacial, Hopton. Upper Glacial, Bridlington.  Post-glacial, 
March, and Kelsea Hill. 
This species I have not seen from the Red Crag of Walton Naze, nor does it occur in 
that of Bentley. It is abundant, though generally small of size, in the Red Crag of 
Butley, especially in the Serodccularia bed ; and I am informed by Mr. Reeve that it is 
common in the Fluvio-marme Crag at Bramerton. Though once so abundant in the 
double state in the Chillesford bed at Chillesford, none can now be found there, but a 
colony of the double shells was found by the Rev. O. Fisher in the same bed at Sudbourn 
Church Walks. It occurs in the Lower Glacial pebbly sands at Runton Gap, double, 
and with its syphonal ends erect as it lived, and fragments of it are abundant in the 
Middle Glacial sand at Hopton. At Bridlington the ordinary form only, so far as I am 
aware, occurs, but Mr. Leckenby (‘ Geol. Mag.,’ vol. ii, p. 348), mentions the variety 
Uddevallensis as occurring in the Boulder Clay, near Scarborough. Uddevallensis does 
not seem to have appeared in Britain until towards the close of the Glacial period. 
Puonas canpipa, Linné. Supplement, Tab. X, fig. 25. 
PHOLAS cCANDIDUS, Linn. Syst. Nat., ed. xii, p. 1111. 
—  PAPYRACEA, Spengl. Skriv. Natur. Selsk., vol. ii, pl. i, fig. 4. 
Lister, Hist. Conch., pl. 435, fig. 278. 
Length, \¥ inch. 
Locality. Fluvio-marine Crag, Bulchamp ? 
A single specimen of this species was obtained by the Rev. Jno. Gunn some years 
since, and given to the British Museum, and it has the above locality marked upon the 
tablet, but upon application to Mr. Gunn for a confirmation of this, he was not able, 
from lapse of time, to say precisely where the specimen was found. 
There is every appearance of its being a Crag fossil, and I have no doubt of its being 
genuine, and that it may be referred to the above-named species. I have not heard of 
its having been found elsewhere as a fossil of the Crag or of any other of the Upper 
Tertiaries of Hast Anglia, 
