POTAMOPHILA.
ASTARTE.
PULLASTRA.
"Cyrene is a foreign genus.
"In the Conchæ marìnæ the genera are very numerous. They are all assembled under the Venus of Linnæus. Lamarck reduced the genus; but it has been yet further divided by later writers.
| Cyprina, | } | From Venus, Lamarck's genera. | |
| Cytherea, | |||
| Venus, | |||
| But | Pullastra, | ||
| Astarte, | |||
| Venerupes, | |||
| and Potamophila have been since withdrawn from the original genus. | |||
"Pullastra was the name of a species, and includes V. pullastra, V. papilionacea, V. decussata, V. litterata, V. virginea.
"Astarte includes some British species, V. Scotica, &c.
VENUS.
CYTHEREA.
ISOCARDIA.
"Potamophila is a scarce river-shell from Ceylon. Some species have also been brought from Congo by African travellers. The form is triangular, 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 Venus there are three cardinal teeth, close together, on each valve, with divergent lateral teeth. V. lamellata is rare and beautiful, from the seas of New Holland. There are many species of Venus in a fossil state. In Cytherea we find four cardinal teeth on the right valve, three of them near together, the fourth quite apart. The left valve has three cardinal teeth. C. Dionè, the thorny Venus, is a pretty shell with spines. You may easily procure it.