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SUPPLEMENT TO THE BRITISH 



convinced that we have two species • and A. decemcostala may perhaps be a synonym of 

 megatrema. 



We may mention that an incomplete ventral valve of an Argiojje, much resembling 

 the one under description, has been found by the Rev. J. F. Blake in the Red Chalk 

 of Hunstanton. 



11. Magas pumilus, Sow. Dav., Cret. Mon., PL II, figs. 1 — 12 and 33. 

 Specimens from Charlton, Kent. Upper Chalk. 



12. Magas? Gteinitzi, Schloenbach. 



Magas Geinitzi, Schloenbach. Beitrage zur Palaontologie der Jura und Kreide-For- 



mation im nordwestlichen Deutschland, Abdruck 

 aus ' Palaeoritographica,' p. 32, pi. xxxix, fig. 4S. 



Mr. Meyer obtained a small shell from the Chloritic Marl of Dunscombe Cliff (west 

 of Beer) which he believes to agree very well with Schloenbach's figures, but he could 

 not get at the interior. In shape it is slightly longitudinally oval, with a small depression 

 in front. The surface is covered with small granulations or punctures, and is marked 

 with a few concentric lines of growth. It measures 3^ lines in length, by 3 in width, 

 and 2 in depth. 



I know so very little of the so-termed Magas ? Geinitzi that I can offer no opinion 

 with respect to the identification ; nor am I at all certain that Schloenbach was correct 

 in referring his genus to Magas. This identification is, therefore, quite provisional and 

 even doubtful, and is given simply for the sake of reference. Schloenbach's specimens 

 are from the Stage Cenomanien of Essen, in Westphalia. 



13. Terebratella Menardi, Lamarck. Dav., Cret. Mon., PL III, fig. 42; and Sup., 



PL VIII, fig. 14. 



Mr. Meyer is of opinion that T. Menardi, Lamarck, and T. truncata, Sow., should be 

 considered as specifically distinct. The only difference I can perceive between the two is 

 that the Lamarckian species is rather longer and a little more transverse ; its ribs are 

 likewise somewhat sharper. 



I have a specimen from the Chloritic Marl of Chardstock, PL VIII, fig. 14, agreeing 

 in every respect with the typical T. Menardi, Lamarck, from Le Mans, in Prance. 



