[4] κεφαλή, head; γαστήρ, stomach; σκάπτειν, to dig; πέλεκυς, an axe; πούς, ποδός, a foot.
[5] Also known as Lamellibranchiata, Conchifera, and Acephala.
[6] πτερόν, wing.
[7] γλῶσσα, tongue; φέρειν, to carry.
[8] λείπειν, to be wanting.
[9] ἀμφί, on both sides; νεὕρον, nerve, vessel. Some authorities regard the Amphineura as a distinct Order.
[10] πολύς, many; πλάξ, plate.
[11] πρόσω, in front. Often alluded to in the sequel as ‘operculate Gasteropoda.’
[12] κτενίδιον, a little comb.
[13] δὐω, two; mόnos, single; ὦτα, auricles; καρδία, heart.