"we served crab and plaice and turbot and herrings"

A crab is a ten-legged crustacean;

A crab
GNU Free Documentation LicenseA crab - Credit: Jacob, Wikimedia Commons

 

Plaice
Public DomainPlaice - Credit: Garitzko, Wikimedia Commons

plaice and turbot are types of flatfish;

 

 

 

 

 

 

 

 

 

 

herring are oily fish.