CORBICULA FLUMINALIS. 39 



Remarks. — This species was known to Wood from Bramerton only; no other 

 Crag localities have been reported since the publication of his second Supplement. 



Valvata piscinalis (Miiller). 



1774. Nerita piscinalis, Miiller, Verm. terr. fluv. Hist., pt. ii, p. 172, no. 358. 

 1848. Valvaia inscinalis, S. V. Wood, Mon. Crag Moll., i^t. i, p. 112, tab. xii, fig. 3. 

 1853. Valvata piscinalis, Forbes and Hanley, Brit. Moll., vol. iii, p. 19, pi. Ixxi, figs. 9, 10 

 1862. Valvata piscinalis, Jeffreys, Brit. Conch., vol. i, p. 72, pi. iv, fig. 8. 

 1890. Valvata piscinalis, C. Eeid, Plioc. Dep. Brit, p. 230. 



1897-1901. Valvata piscinalis, Keunard and B. B. Woodward, Essex Nat., vol. x, p. 108, 1897; Proc ' 

 Malac. Soc, vol. iii, p. 201, 1899; Proc. Geol. Assoc, vol. xvii, pp. 217 et seq., 1901. 



Specific Characters. — See Mon. Crag Moll., pt. i, p. 112. 



Dimensions. — L. 7 mm. B. 6. mm. 



Distribution. — Recent : throughout the British Isles ; abroad from Siberia to 

 Naples ; Transcaucasia, Turkestan, Cashmere, Thibet. 



Fossil: Icenian Crag : Bramerton, Yarn Hill. Freshwater-beds: 

 West Runton, Mundesley. Pleistocene and Holocene of Great Britain, widely 

 distributed. 



Pleistocene : Menchecourt, Joinville-le-Pont ; Denmark. Holocene : Denmark 

 and Sweden (Nordmann). 



RemarJiS. — Bramerton was the only locality in the English Crag known to Wood 

 at which this species had been found. Mr. A. Bell informs me he has since seen 

 a specimen from Yarn Hill. The variety antiqua occurs in the Pleistocene beds at 

 Grays (Morris), and Mr. Reid reports both the typical and depressed form from the 

 Forest-bed series. 



FULUCYFOBJ. 



Genus CORBICULA, Megerle von Miihlfeldt, 1811. 

 Corbicula fluminalis (Miiller). 



1774. Tellina fluminalis, Miiller, Verm. terr. fluv. Hist., vol. ii, p. 205, no. 890. 



1834. Cyrena trigonula, S. V. Wood, Mag. Nat. Hist., vol. vii, p. 275, fig. 45. 



1836-44. Cyrena Gemmellarii, Pbilippi, En. Moll. Sic, vol. i, p. 39, pi. iv, fig. 3, 1836 ; vol. ii, p. 31, 



1844. 

 1838. Cyrena Duchastellii, Nyst, Bull. Acad. Eoy. Sci. Belg., vol. v, p. 114, pi. i, figs. 1-4. 

 1850. Cyrena consobrina, S. V. Wood, Mon. Crag Moll., pt. ii, p. 104, tab. xi, fig. 15. 

 1872. Corhicida fluminalis, S. V. Wood, Mon. Crag Moll., 1st Suppl., p. 119. 



