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LIMESTONE FROM THE NORTH SEA. 



17 



Remarks. — This species is of fairly abundant occurrence, and 

 shows relationship both to Y. Jiyperhorea Torell and to Y. limatula 

 Say, of modern seas (boreal), from which it chiefly differs in the 

 possession of thicker and more convex valves. 



Distribution. — Red Crag to Post-Pliocene (Britain). 



Family Luclnid.^. 

 Dentiltjcina borealis (Linnaeus). 



Venus borealis Linnaeus, ' Systema. Naturae ' 12th ed. 1767, vol. i, pt. 2, p. 1134. 

 Dentilucina borealis Sacco, 'Moll. Teiz. Piemonte' 1901, pt. 29, p. 80 & 

 pi. xviii, figs. 23-26. 



Distribution. — Yindobonian (Holland, Italy, Austria) ; Re- 

 donian (North-Western France) ; Messinian (North Germany) ; 

 Anversian, Diestian, and Scaldisian (Belgium); Plaisancian and 

 Astian (Italy, France) ; St. Erth Beds to Post-Pliocene (Britain) ; 

 Recent (Mediterranean and British Seas, etc.). 



Family Thyasiridje. 

 Thyasira plextjosa (Montagu). 



Venus sinuosa Donovan, 'Nat. Hist. British Shells' 1801, pi. xlii, fig. 2, 



non Pennant, 1777. 

 Tellina flexuosa Montagu, "Test. Britannica' 1803, pt. 1, p. 72. 

 Thyasira flexuosa (Leach MS.), Lamarck, ' Histoire Naturelle des Animaux 



sans Vertebres ' 1818, vol. v, p. 492. 



Distribution.— Redonian (North -Western France); Anversian 

 to Scaldisian (Belgium) ; Coralline Crag, Chillesford Beds, and 

 Post-Pliocene (Britain) ; Recent (Mediterranean and British 

 Seas, etc.). 



Family Cardiid^:. 



LjaVICARDITTM FRAGILE (BrOCchi). 



Cardium fragile Brocchi, ' Conchiologia Fossile Subapennina ' 1814, vol. ii, 



p. 505 & pi. xiii, fig. 4. 

 Lcevicardium norvegicum Sacco, ' Moll. Terz. Piemonte ' 1899, pt. 27, p. 51 & 



pi. xi, figs. 41-42. 



Distribution. — Vindobonian (Austria) ; Messinian (North- 

 Western Germany) ; Plaisancian and Astian (Italy). 



Family Cyprinidjd. 

 Cyprina islandica (Linnaeus em. Miiller). 



Venus islandica Linnaeus, 'Systema Naturse ' 1767, 12th ed. vol. i, pt. 2, p. 1131 

 (without reference to a type form); Miiller, ' Zool. Danicse Prod.' 1776, p. 246 

 (no. 2977). 



Cyprina islandica Nyst, 'Coquilles & Polypiers Foss. Tert. Belg.' Mem. Cour. 

 Acad. Roy. Belg. 1843-45, vol. xvii, p. 146, pi. ix, fig. 1 & pi. xi, fig. 1. 



Q. J. G. S. No. 285, c 



