Tank Kr. 21. 



41 



rig. 114. Pennaria Cavolinii, 

 p. 61. 



Fig. 115. Tubular la larynx. 

 p. Gl. 



Polyzoa (p. 08). Retepora (fig. 110) ; Myriozoum (fig. 117). 



Fig. lie. Retepora celhilosa, 



'/^ nat. size, p G8. 



Fig. 117. Myriozoum truncatiim, 

 '/^ nat. size. p. 68. 



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

 rough Tangierinc orange. A.rlnella (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), inconspicuous , grey or brown colour , velvety 

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

 tank. 



6 



