POTAMOPHILA. ASTARTE. PULLASTRA. 5] 



" Cyrene is a foreign genus. 



" In the ConchcB marhidd the genera are very 

 numerous. They are all assembled under the 

 Ve/u(s of Linnaeus. Lamarck reduced the genus ; 

 but it has been yet further divided by later 

 writers. 



'.} 



Cyiwlna, 



Cytlterea, ^From Venus, Lamarck's genera. 



Venus ^ 

 But Pullastra, 



Astarte, 



Veneruj)€S, 

 2ii\di PotamopMla have been since withdrawn from 

 the original genus. 



" Pullastra was the name of a species, and 

 includes V. pullastra, V. papilionacea, V. de- 

 cussata, V. lltterata, V. virginea. 



*' Astarte includes some British species, V. 

 Scotica, &c. 



" Potamophila is a scarce river-shell from Cey- 

 lon. Some species have also been brought from 

 Congo by African travellers. The form is tri- 

 angular, very thick, covered with an olive-green 

 epidermis. Lamarck's two genera have been still 

 further reduced ; but I shall refer you to the 

 Museum for their new names. Observe, in 



D 2 



