I yesterday drew a coloured figure of the lower part of one of these animals.
This animal in its perfect state (such as we found it in today) consists of two individuals, the part of one being encased in a cavity of the other.

Figures 4 and 5 Illustration 4 will give a correct idea of the way in which this junction is effected.

The least motion separates these two parts, and each forms a perfect animal, which performs all the functions of life.

This is the more extraordinary, as the containing animal is furnished with an organ not possessed by the contained, and which in their united state is used by both.

Figure 5.