Vm LIST OF PLATES. 



3. Bonax anatinus, or Duck's-bill Wedge. 



4. Scrobictdaria compressa. 



5 . Tellina Donaci7ia, so named from its resemblance to the Bonax. 



Plate VIII. 



1. Mactra stultorum. 



2. Mactra elliptica, with the animal having united tubes and a 



long bent foot, 



3. Tapes virginea ; the hinge having three compressed central 



teeth. 



4. Vemis fasciata ; hinge having three and two broader teeth. * 



5. Cytheraa Chione ; hinge mth central teeth and one anterior 



tooth. 



Plate IX. 



1. Lepton squamosum, enlarged, showing the cilia, tubes, and 



foot of the animal. 



2. Oyclas cornea, a fresh-water bivalve. 



3. Fisidium amnictim, also fresh-water. 



4. Oyprina Islandica; coated with epidermis, no sinus in the im- 



pression of the mantle. 



5. Artemis lincta : teeth resembling CytJieraea ; impression of 



the mantle with a deep angular sinus. 



6. Astarte JDanmoniensis or Scotica. 



Plate X. 

 1, Cardium edule, or eatable Cockle. 



