LAMARCK THE ZOOLOGIST 189 
’ 
“ Radiaires”’ included the Echinoderms (the Vers 
echinoderms of Bruguiére) and the Meduse (his Ra- 
diaires molasses’’), the latter forming the Discophora 
and Siphonophora of present zoGlogists. This is an an- 
ticipation of the division by Leuckart in 1839 of the Ra- 
diata of Cuvier into Ceelenterata and Echinodermata. 
The “ Polypes”’ of Lamarck included not only the 
forms now known as such, but also the Rotifera and 
Protozoa, though, as we shall see, he afterwards in his 
course of 1807 eliminated from this heterogeneous 
assemblage the Infusoria. 
Comparing this classification with that of Cuvier * 
published in 1798, we find that in the most important 
respects, z.¢., the foundation of the classes of Crusta- 
cea, Arachnida, and Radiata, there is a great advance 
over Cuvier’s system. In Cuvier’s work the molluscs 
are separated from the worms, and they are divided 
into three groups, Cephalopodes, Gasteropodes, and 
Acephales—an arrangement which still holds, that of 
Lamarck into Mollusques céphalés and Mollusques 
acéphalés being much less natural. With the elimi- 
nation of the Mollusca, Cuvier allowed the Vers or 
Vermes of Linné to remain undisturbed, except that 
the Zodphytes, the equivalent of Lamarck’s Polypes, 
are separately treated. 
He agrees with Cuvier in placing the molluscs at 
the head of the invertebrates, a course still pursued 
by some zoélogists at the present day. He states in 
the Philosophie Zoologique + that in his course of lec- 
* Tableau éémentatre del’ Histoire naturelle des Animaux, Paris, 
An VI. (1798). 8vo, pp. 710. With 14 plates. 
{Ome 1s ps. 123. 
