The brain con sists not only of a group of six capsules corre sponding to the archi cerebrum of the Oligo chaeta, but of a further mass of cells surrounding S S and existing below the alimentary canal, which can be analysed into five or six more separate ganglia.
Both ctenidia, right and left, are invariably present, the axis of each taking origin from the side of the body as in the schematic archi-Mollusc (see fig.
(See especially Brazil; India; Malay Archi Pelago.) Union with Spain had exposed Portugal to the hostility of the strongest naval powers of western Europe, and had deprived it of the power to conclude an independent peace.
The Arthropoda are all distinguished from, The prostomial the Chaetopoda by the fact that the head A ganglion-mass or consists of one or more somites which lie in archi cerebrum.