Tank Nr. 21, 



41 



Fig. 114. Pennaria Cavolinii. 

 p. 61. 



Fig. 115. Tubular 'ia larynx. 

 p. 61. 



Polyzoa p. 68). Retepom (fig. 116); Myriozoum (fig. 117). 



Fig. 1 1 6. Retepora cellulosa. 

 !/2 nat. size. p. 68. 



Fig. 117. Myriozoum truncatum. 

 J /2 nat. size. p. 68. 



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

 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), inconspicuous, 

 grey or brown colour, velvety surface, a few large holes ; 

 generally in the front of the tank. 



