20 



MYA plicata. 



TAB. CCCCXIX.— /^. 3. 



Spec. Char. Oblong, ventricose, straight, an- 

 teriorly gaping, truncated; posterior side 

 very short, transversely plicated. 



About twice as wide as long-, nearly cylindrical ; the 

 whole surface is a little waved, but the posterior side 

 near the beaks, is remarkably so. 



Found in ferruginous Sand mixed with a few 

 grains of green Sand, at Sandgate near Margate. 



MYA intermedia. 

 TAB. CCCCXIX.— /o^. 2. 



M. HIS may possibly be a distinct species, but I am in- 

 clined to represent it as a variety only, because the spe- 

 cimen formerly figured, (tab. 76.) is not so perfect, and 

 may have been expanded by pressure. 



Many specimens like the one before us, have been 

 found in the Bognor Rocks with the external ligament 

 remaining. 



It is impossible to say positively to what Genus these 

 and some other fossils referred to Mya rightly belong, 

 as we cannot find the inner parts of the hinges. Several 

 of them resemble Leach's Genus Thracia, in having an 

 external ligament, but that Genus is included in Anatina 

 among the Myaires by Lamarck, and even the Lutraria 

 has a small external ligament, although they are both 

 arranged in families, supposed to have only an internal 

 one : thus the recent Genera do not appear to be suffi- 

 ciently settled to refer the fossils to, if even we did know 

 the whole of their hinges. 



