Dear Professor L.,
If you’re going to use the phrase ‘bivalves’ throughout the term to describe invertebrates such as clams, oysters and mussels, then please, for the sake of my sanity, do not start using a different word to describe them in the sample questions for the final exam. Because the word you used (Lamellibranchia) was not a word that ever showed in the class notes. And I just about thought I was losing it (or, even worse, had LOST some of my notes) because I did not recall this word or was able to find it.
And then I put the word into a search engine and it came up with a dictionary definition that said that the Lamellibranchs are clams, oysters, mussels.
P.S. You’re just lucky that I filled out my professor evaluations before I read that question.