Tank Nr. 4. 



11 



Tank Nr, 4. 



Ascidians (Sea-squirts, p. 84). dona (fig. 28), white half- 

 transparent double tubes. Phallusia (fig. 29) , knobbed 

 white mass. Cynthia (fig. 30), crimson-scarlet, sausage- 

 shaped; the mouths of the two tubes can be seen pro- 

 jecting. Colonies of Diazona (fig. 31). Many other kinds. 

 TubiCOlous worms (see Tank 22), a foot high, like 

 feathery palms. Fishes. Heliases (fig. 32), small and 



Fig. 28. 

 Four specimens of Ciona intestinalis. 



1 2 nat. size. p. 84. 



Fig. 29. 

 Phallusia mammillata. 



1 o'nat. size. p. 85. 



Fig. 30. Four specimens of 

 Cynthia papillosa, 

 */2 nat. size. p. 84. 



Fig. 31. 

 A colony of Diazona violacea, 



1 3 nat. size. p. 85. 



