Calcinea definitions

Calcinea

The Calcinea are a subclass of the calcareous sponges. ...
Found on http://en.wikipedia.org/wiki/Calcinea

---

Calcinea

(from the article `sponge`) ...small in size; inhabit shallow waters of all seas, from intertidal regions to depths of 200 m (660 ft); a few species to 800 m (2,600 ft); about ...
Found on http://www.britannica.com/eb/a-z/c/6

---