Ectoprocta 181 



Frequently in some of the cultures there appeared a gelatinous coating 

 over the bottom of the dish, covering the colonies. If this were not 

 removed, the colonies would die from suffocation, lack of food, etc. This 

 scum occurred more frequently in flat stender dishes than in finger bowls 

 and Pyrex glassware. When such a condition occurs, the Bryozoa must 

 be transferred to another dish, the scum must be removed from them with 

 dissecting needles, scalpel, or other suitable instrument. They should 

 then be placed in a sterilized finger bowl in fresh pond water. 



Lophopodella will tolerate stagnant and polluted water to a surprising 

 extent. A number of colonies were placed in an aquarium with two 

 large stones which had a small amount of dirt and algae on them, some 

 broken lily pads, and a small amount of Elodea, to which was added 

 lake water (about 5 gallons). At the end of ten days, the water was a 

 cloudy yellow in color, turbid, and gave off a very bad odor. The col- 

 onies however were in excellent condition. Pectinatella, Cristatella, and 

 some of the other Bryozoans could not tolerate such conditions so well. 



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