436, to be exact. I collected these bivalve shells at a beach in Puerto Rico in 1994. I believe they are Donax variabilis.
224 of the shells are right valves and 212 are left valves. I did a chi-square test and the difference was not significant (P=0.565).
What else can I do with them? Some have drill holes or chipped edges, providing evidence for predation. There are a few very small, presumably juvenile, shells. Perhaps, I can measure them all and look at the distribution of shell sizes. Or, maybe I can measure the volumes of a subsample and look at the change in shell volume during growth. What else?