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LIMESTONE PROM THE NORTH SEA. 



19 



It is interesting to find among these fossils a new Dosiniform 

 shell that can be referred to Jukes-Browne's Sinodia, 1 which 

 was established on the type of Dosinia trigona of Reeve, and 

 also includes the Venus excisa of Chemnitz. Sinodia is chiefly 

 distinguishable from the true Dosinia by reason of its oblicpie 

 and straight dorso-anterior margin, followed by an expanded 

 anterior side. It is known only in the living state, being restricted 

 to the waters of the Indian Ocean, particularly the coasts of 

 Southern Asia. 



Family Telpinidjg. 

 Tellina benedeni Nyst & Westendorp. (PI. II, fig. 17.) 



Tellina zonaria Nyst, ' Recliercli. Coq. Foss. Anvers ' 1835, p. 4, non Basterot. 

 Tellina benedeni Nyst & Westendorp, Bull. Acad. R. Sci. Bruxelles, 1839, 



vol. vi, pt. 2, pi. ii, fig. 5 bis & pi. iii, fig. 5, p. 399. —T. fallax Beyrich, 



a manuscript name. 



Remarks. — This is by far the most abundant mollusc in the 

 limestone, and well agrees with the typical form from the Belgian 

 Upper Tertiaries. Examples are chiefly preserved as natural casts 

 which exhibit well-marked muscular and other impressions, as also 

 the extensive pallial sinus with its elevated and obtuse summit. 



Distribution. — Anversian to Scaldisian (Belgium) ; Middle 

 Pliocene (Holland) ; Lenham Beds and Red Crag — derivative 

 (Britain). 



Family Saxicayid,p. 

 Panop.ua menardi Deshayes. 



Panopcea faujasii Basterot, Mem. Soc. Hist. Nat. Paris, 1825, vol. ii, pt. 1, 



p. 95, non Menard de la Groye. 

 Panopcea menardii Deshayes, ' Diet. Class. Hist. Nat.' 1828, vol. xiii, p. 22. 

 Panopcea gentilis J. de C. Sovverby, ' Mineral Conchology ' 1840, vol. vii, 



p. 1 & pi. dcx, fig. 1. 



Distribution. — Yindobonian (France, Poland, Austria, Switzer- 

 land, Italy, Holland) ; Anversian and Scaldisian (Belgium) ; 

 Boxstones, Coralline Crag, and Red Crag — probably derivative 

 (Britain). 



Family Mactridje. 

 Spisula oyalis (J. Sowerby). 



Mactra ovalis & dubia J. Sowerby, ' Mineral Conchology ' 1817, vol. ii, p. 136 

 & pi. clx, figs. 2-5. 



Distribution. — Yindobonian (Switzerland); Redonian (North- 

 western France) ; Middle Pliocene (Holland) ; Scaldisian (Bel- 

 gium) • Red Crag to Post-Pliocene (Britain) ; Recent (British Seas, 

 non Mediterranean). 



1 Proc. Malacol. Soc. London, vol x (1912) pp. 100-104. 



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