Animal. As above.
Shell. Solid, thick, regular, perfectly equivalved and close, more or less inequilateral; summits well marked and inclined to the front; hinge subsimilar; the middle cardinal tooth forked, or three cardinal teeth more or less contiguous and convergent towards the summits; ligament thick, often arcuated, convex, exterior; two distant muscular impressions; cordiform depressions beneath the beaks. Inhabits the British and American seas. One hundred living species. Nine fossil.
- Venus reticulata.
- V. rugosa.
- V. corbis.
- V. crebiscula.
- V. discina.
- V. cancellata.
- V. marica.
- V. sulcaria.
- V. cardivides.
- V. texturata.
- V. elliptica.
- V. rariflamma.
- V. mercenaria.
- V. pullastra.
- V. gallina.
- V. truncata.
- V. pectinula.
- V. anomala.
- V. lamellata.
- V. exilis.
- V. rufa.
- V. Scotica.
- V. hiantina.
- V. virginea.
- V. corugata.
- V. ovulæa.
- V. papilionacea.
- V. callipyga.
- V. punctifera
- V. nebulosa
- V. literata
- Venus floridella.
- V. aphrodina.
- V. pulchella.
- V. aphrodinoides.
- V. tristis.
- V. flammea.
- V. puerpera.
- V. verrucosa.
- V. pygmæa.
- V. casina.
- V. crenulata.
- V. plicata.
- V. granulata.
- V. pectorina.
- V. cingulata.
- V. textilis.
- V. grisea.
- V. geographica.
- V. Dombeii.
- V. decussata.
- V. lagopus.
- V. glandina.
- V. gallinula.
- V. retifera.
- V. sulcata.
- V. galactites.
- V. exalbida.
- V. scalarina.
- V. dorsata.
- V. aurea.
- V. crassisulca.
- V. carneola.
- V. petalina.
- V. cornularis.
- V. adspersa.
- V. opima.
- V. turgida.
- V. flammiculata.
- V. strigosa.
- V. Perronii.
- V. elegantina.
- V. undulosa.
- V. vermiculosa.
- V. vulvina.
- V. marmorata.
- V. Malabarica.
- V. laterisulca.
- V. subrostrata.
- V. phaseolina.
- V. Florida.
- V. bicolor.
- V. catenifera.
- V. sinuosa.
- V. rimularis.
- V. ovata.
- V. pumila.
- V. inquinata.
- · · · · ·
- V. notata.*
- V. præparea.*
- V. elevata.*
- V. inequalis.*
- V. castanea.*
- V. Nuttallii*
- V. staminea.*
- V. Californica.*
- V. lamellifera.*
- V. Mortoni.*
4. Genus Venericardia. Pl. [VII].
Animal. Nearly as above.
Shell. Suborbicular, inequilateral, equivalve, sides having usually longitudinally rayed ribs; hinge with two oblique cardinal teeth in each valve, turned in the same direction. Five living species. Ten fossil species.
- Venericardia Australis.
- V. imbricata.
- V. flammea.
- V. Tankervillii.
- V. crassicosta.
Conchæ Fluviatiles. Three Genera.
5. Genus Cyclas. Pl. [VII].
Animal. Body oval, thick; edges of the mantle simple; tubes short and united; foot wide, compressed at base, and terminated by a sort of leg or appendage.