_Les Radiaires._ 9.

_Les Polypes._ It will be seen that at this date two additional classes are proposed and defined--_i.e._, the Annelides and the Cirrhipedes, though the class of Annelida was first privately characterized in his lectures for 1802.
The elimination of the barnacles or Cirrhipedes from the molluscs was a decided step in advance, and was a proof of the acute observation and sound judgment of Lamarck.

He says that this class is still very imperfectly known and its position doubtful, and adds: "The Cirrhipedes have up to the present time been placed among the molluscs, but although certain of them closely approach them in some respects, they have a special character which compels us to separate them.

In short, in the genera best known the feet of these animals are distinctly articulated and even crustaceous (_crustaces_)." He does not refer to the nervous system, but this is done in his next work.

It will be remembered that Cuvier overlooked this feature of the jointed limbs, and also the crustaceous-like nervous system of the barnacles, and allowed them to remain among the molluscs, notwithstanding the decisive step taken by Lamarck.