﻿BIVALVIA. 



163 



Mya truncata, Linn. Crag Moll., vol. ii, p. 277, Tab. XXVIII, fig. 1. 



Localities. Cor. Crag passim. Red Crag passim. Fluvio-marine Crag, Bramerton. 

 Chillesford bed, Chillesford and Sudbonrn 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 Scrobicularia bed ; and I am informed by Mr. Reeve that it is 

 common in the Fluvio-marine 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. Uddevattensis does 

 not seem to have appeared in Britain until towards the close of the Glacial period. 



Pholas Candida, Linne. Supplement, Tab. X, fig. 25. 



Pholas candidus, Linn. Syst. Nat., ed. xii, p. 1111. 



— paI'YRAcea, Spengl. Skriv. Natur. Selsk., vol. ii, pi. i, fig. 4. 



Lister, Hist. Conch., pi. 435, fig. 27S. 



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 East Anglia. 



22 



