PHYLLIRHOE BUCEPHALA.
This little animal belongs to the family of snails, class Heteropoda, is about an inch long, and is devoid of any shell or covering whatever. It is flat, and so absolutely transparent that a person can read through its body. It is provided with a pair of feelers. The little animal is very luminous if placed in fresh water or disturbed, but this phenomenon is most beautiful when an ammonia solution is poured over the animal. It will shine with a vivid blue light, which extinguishes with life. But even after death the nerve cells, which are directly below the skin and produce the light, can be irritated sufficiently to become luminous. It is a singular fact that electricity has no effect upon these nerve cells.
