OF MOLLUSCA FROM "annelids". Attention for missing scales on the back
of the Polynoide annelid in Figure, is not normal. Creepers
polychaetes gave rise to animals that preceded the Mollusca, with ventral
adhesive glands, that allowed an adherence to coastal rocks,where algae are fixed, It would be
used as food by scraping, which would result in the emergence of the radula. The
parapodia must be fused in an organ adhesive and locomotor, which served for
the animal to explore the bedrock. Dorsal scales of Aphroditidae are connected
to dorso-ventral muscle, in the same manner as dorsal plates of the Polyplacophora.