CHORDATA 



237 



is still hazy) form similar coatings to the stems of the oar- 

 weeds, or form slightly elevated bosses on stones and 

 shells. 



The beautiful, crystal -looking Clavellina lepadiformis 

 lives in clear pools, not 

 necessarily far down in 

 tide range, Clusters of 

 them may be obtained 

 by tilting or overturn- 

 ing boulders that are 

 in whole or part sub- 

 merged. 



The novice may easily 

 overlook them, for they 

 are transparent as glass, 

 only lines of yellow, like 

 some fine gold twist, 

 and some dark lines, 

 yellow and red, marking 

 the intestine and other 

 details of their anatomy. 

 They are from ha]f-an- 

 inch to three-quarters of 

 an inch in length, and 

 are always attached in 

 clusters to a creeping 

 stem or stolon. 



They multiply in two 

 ways viz. by the libera- 

 tion of tadpoles, as de- 

 scribed, and also by budding up from the stolon, like 

 mushroom caps from their mycelium. 



In the same localities, still less conspicuous, although per- 

 haps more abundant, are little round ones, like glass beads, or 

 rather like grains of cooked tapioca, in size, colour, and feel. 



Fig. 101. BotryflitK xchloxxtti, on 

 fucus. Natural size 



