Tank Nr. 21. 



11 



Fig. 114. Pennaria Cavolinii 



p. 61. 



Fig. 115. Tubularia larynx. 



p. 61. 



Polyzoa (p. 68). Eetepora (fig. 116); Hyriozoum (fig. 117). 



Fig. 116. Retepora cellulosa, 

 */ 2 nat size. p. 68. 



Fig. 117. Myriozouni trniu:aluni, 

 l l t nat. size. p. 68. 



Siliceous Sponges (p. 55). Tethya (fig. 119), on the sanrl; like a 

 rough Tangierine orange. Axinella (fig. 120), red branches, 

 thicker and more irregular than the coral Gorgonia Other 

 kinds, white, brown or pink, bowl-shaped or finger-shaped, 

 on the rocks. Horny Sponges. The Toilet-sponge {Euspongia, 

 fig. 118) , incospicuous , grey or brown colour, velvety 

 surface , a few large holes; generally in the front of tho 

 tank. 



