Tank No. 4. 



Tank No. 4. 



In the centre a group of Tubicolous Worms (sea tank 22), 

 a foot high resembhng palms. Over the whole floor are scattered 

 Ascidians (Sea-squirts, p. 99), Cynthia (fig. 28) crimson-scarlet, 

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

 jecting. Phalhtsia (fig. 29), knobbed white mass. Ciona (fig. 30), 

 white half-transparent double tubes. Colonies of Diazona (fig. 31) 

 composed of a number of separate animals. 



Fishes. Heliases (fig. 32), small and black with deeply forked tail. 



*Apogon (fig.33),red,on]yin summer . Lichia (fig. 42), silvery. 



Sea-weeds. Red algae {Sehdenia and Vidalia) like 



withered beech-leaves. Green alga {C odium bursa), dark 



green balls from the size of a marble to that of a melon. 



Fig. 28. Four specimens of 



Cynthia papulosa, 

 i/'o nat size. p. 99. 



Fig. 29. 



Phalhtsia viamillata, 



1/2 nat. size. p. 99. 



Fig. 30. Four specimens of 

 Ciona infestinalis, 

 1/2 nat. size. p. 99. 



Fig. 31. A colony of 



Diazona violacea, 

 1/3 nat. size. p. 100. 



