100 



PROTOZOOLOGY 



charide which is insoluble in boiling water, but dissolves in concen- 

 trated sulphuric acid, potassium hydroxide, and slowly in formalde- 

 hyde. It does not stain with either iodine or chlor-zinc-iodide and 

 when treated with a dilute potassium hydroxide, the paramylon 

 bodies become enlarged and frequently exhibit a concentric stratifi- 

 cation. 



In the Chrysomonadina, the reserve food material is in the form 

 of refractile bodies which are collectively called leucosin, probably a 

 carbohydrate. Oils occur in various Protozoa and when there is a 

 sufficient number of oil-producing forms in a body of water, the 

 water may develop various odors. Table 4 shows kinds of odor pro- 

 duced by certain Protozoa when they are present in the water in 

 large numbers: 



Table 4. — Protozoa and odors of water 



Fats have also been detected in many Protozoa, such as Myxo- 

 sporidia, Protociliata, certain Eucihata, Trypanosoma, etc. Accord- 

 ing to Panzer, the fat content of Eimeria gadi was 3.55 per cent and 

 Pratje reports that 12 per cent of the dry matter of Noctiluca scintil- 

 lans appeared to be the fatty substance present in the form of 

 granules and is said to give luminescence upon mechanical or chemi- 

 cal stimulation. A number of other dinoflagellates, such as Peridi- 

 nium, Ceratium, Gonyaulax, Gymnodinium, etc., also emit lumi- 

 nescence. In other forms the fat may be hydrostatic in function, as 

 is the case with a number of pelagic Radiolaria, many of which are 

 also luminous. 



Another reserve food-stuff which occurs widely in Protozoa, ex- 



