(1) Sea urchins, like bivalve molluscs, are cosmopolitan in their distribution and by selecting a range of species a regular supply of gametes can be obtained for laboratory testing purposes.(2) These and other studies from native habitats have demonstrated that green crabs have a broad diet range, but that bivalve molluscs generally make up the largest part of their diet.(3) Thus, they are mechanically much weaker than other bivalve shells and are easily fragmented after break-down of the organic matter.(4) We continue to use these techniques for the isolation of new genes involved in physiological processes in fish and bivalve molluscs.(5) The only bivalve group having comparable hinge features is the Philobryidae (Arcoida, Limopsoidea).(6) The hinge ligament of bivalve shell is an example of a complex development.(7) A bivalve closes its shells by contracting its powerful adductor muscles.(8) There is a large class of plants which have their seeds enclosed in a sort of bivalve pericarp, usually called a "pod."(9) In many bivalve shells, growth lines become closely spaced in the late growth stage, accompanied by prominent shell inflation and thickening of the shell.(10) The soybean plant is called a legume because it produces a bivalve pod or fruit.(11) Large, relatively well-preserved bivalve shells, rhodoliths and nodular bryozoans (several centimetres in size) occur together with volcanic pebbles, at the front of the landward-dipping beds.(12) In bivalve molluscs, growth rate of the shell tends to decelerate with growth and the shell generally becomes more inflated in the late growth stage.(13) However, as early as 1923 Collip reported finding insulin-like activity in a bivalve mollusc, Mya arenaria.(14) Other species take refuge in a protective structure surrounding their body, such as polychaete tubeworms, caddis fly larvae, gastropod and bivalve mollusks, hermit crabs, barnacles, turtles, and armadillos.(15) The bean seed grows in a bivalve pod called a legume.(16) Many suspension-feeding marine bivalve molluscs live in variable environments such as estuaries and shallow coastal waters.