Dendrochirota 559 



References 

 For the rearing of sea urchins see also p. 197. 

 Order Exocycloida 



For the rearing of sand dollars see also p. 197. 



Class Holothurioidea, Order dendrochirota 



NOTES ON THE CULTURE OF CUCUMARIA 



Martin W. Johnson, Scripps Institution of Oceanography 



THE pelagic larvae of these holothurians are frequently numerous in 

 the plankton samples collected in early spring near Scripps Insti- 

 tution. In the very young stages they are sufficiently large to be dipped 

 from the water where they tend to gather in windrows at the surface. 

 The methods for culture were much the same as for the Echinoidea 

 (see p. 554) but the animals, being relatively large, might be removed 

 temporarily from the culture dish while the water was being changed, 

 and later after the tentacles and tube feet had developed, even this pro- 

 cedure was not necessary for they usually remained attached to the 

 dish. The seawater used in the author's experiments was not filtered in 

 order that the plankton organisms might contribute to the food supply. 

 The animals grow slowly, but healthy specimens have been kept in good 

 condition for over a year. 



