42 



Part first. 



Fig. 118. Euspongia officinalis 

 attached to a stone. In its 



living state, 

 */3 nat size. p. 55. 



Fig. 119. Tethya 



lyncurium on a stone. 



p. 55. 



Fig. 120. Axinella on a stone, 

 J /2 nat. size. p. 55. 



Sea-weeds. Red algae: Vidalia, brown fronds; the flat, 

 thin, pink and white, hard Corallinse (calcareous); Green 

 algae: Codium, dark green balls; Valonia, glistening green 

 balls like bubbles; Halimeda, cactus-like green jointed 

 plants (calcareous.) 



