PANDORA, 



Two species are described by Lamarck, one of which, 

 the margaritaceaj or rostrata, is frequently found on the 

 shore at Granville, and on the coast of Guernsey ; the 

 ohtusa is found at Weymouth, and in Plymouth Sound ; it 

 has been long ago figured by Pennant, as a new and singu- 

 lar Mi/tilusj found at Weymouth. Mr. G. Humphrey has 

 furnished us with a third recent species from the East Indies, 

 we have named this P . jlexuosa^ and on account of a pecu- 

 liarity in its internal structure, we think it deserving of a 

 more particular notice : in this species the internal liga- 

 ment is no longer attached on the jlat valve to a mere cica- 

 trice, but the part which bears it is produced into the form 

 of an elongated lamina^ diverging from the umbo towards 

 the anterior side of the shell, and reaching nearly to the 

 inner side of the anterior muscular impression, and to the- 

 edge of this the principal part of the ligament in this spe- 

 cies is fixed : but in all the species of this Genus, this liga- 

 ment might properly be said to be divided into two por- 

 tions; the first, and generally the larger to the cicatrices 

 in both valves, and to the anterior part, close to the umbo^ 

 of the tooth in the flat valve; the second, and the smaller 

 in two species, attached in the flat valve near to the anterior 

 side of the cicatrice, and in the concave valve to the ante- 

 rior edge close to the umbo : in the P. flexuosa^ this second 

 part of the ligament is much the larger, and is attached as 

 above described to an elongated lamina. Had Lamarck 

 described this species, we should not have been surprized 

 at his saying it had two teeth, but neither of those he has 

 described are possessed of this lamina. 



We do not know a single instance of its having been 

 found in a fossil state. Of its relations we are unable to. 

 decide; Lamarck seems to us to have judged rightly in 

 placing it near to Corbula^ but as he has erroneously given 

 it two diverging teeth h\ the flat valve, his observation, that 

 " by their hinge th^ PanrJorce seems to approach the Pla- 

 cuncd*^ falls to ground. Its single obtuse tooth in one valve 

 only separates it from Corbulay as its internal ligament does 

 from the Linnean Tellina. 



