Fossil bivalve, Limipecten dissimilis, from the Mississippian Epoch (early Carboniferous) of Petershill, Bathgate, West Lothian, Scotland

Arctica islandica, Icelandic cyprine or ocean quahog, model, produced as Cyprina islandica, made by Guy Lawrence Wilkins, London, England

Spondylus sp., thorny oyster, shell, from California, USA

Spondylus sp., thorny oyster, shell, from California

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Gryphaea arcuata, fossil oysters, in cut and polished limestone half boulder, from the Lower Jurassic Epoch of Camus Malig, Isle of Skye, Scotland

Fossil bivalve, Gryphaea arcuata, fossil oysters (devil's toenails) in cut and polished limestone half boulder, from the Lower Jurassic Epoch of Camus Malig, Isle of Skye, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland

Fossil bivalve, Gryphaea arcuata, one of twenty fossil oysters, from the Lower Jurassic Epoch of Lochaline, Morvern, Argyll, Scotland