Figure 1. Ceramic breeding tube for leech. (A) The panorama of
breeding tube, including a first shell, a second shell and a rubber band
used to fix shells, there are spiracles at tube wall. (B) A leech
produced a cocoon in the breeding tube for less than five hours, and the
honeycomb-like structure on the surface of the cocoon was still not
completely dry yet and the interior is pink.