Nemertina

The earliest Vermalia in which we first find this independent vascular system are the Nemertina (Figure 2.244).

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Balanoglossi, Nemertina, Icthydina, etc., have more or less departed from the primitive model owing to adaptation to special environment.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The Nemertina were formerly classed with the much less advanced

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The Enteropneusta (Figure 2.245) live in the sea sand, and are long worms of very simple shape, like the Nemertina.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

In some of the Nemertina the blood is already coloured, and the red colouring matter is real haemoglobin, connected with elliptical discoid cells, as in the Vertebrates.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

They are related, on the one hand, to the Nemertina and their immediate ancestors, the Platodes, and to the lowest and oldest forms of the Chordonia on the other.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

After the Nemertina, I take (as distant relatives) the Enteropneusta; they may be classed together with them as Frontonia or Rhyncocoela

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876