2. Morphological details are included in a diagrammatic fashion 
in most of the stages of the protozoa, but only in the diagnos- 
tic and infective stages of the helminths. 
3. Survival times, pre-patent and patent periods, and developmen- 
tal times are omitted. 
4. Not all of the embryonic and larval stages of the helminths are 
indicated. For example, the number of nematode larval stages 
are not recorded. 
5. Only broad groups of organisms are indicated as invertebrate 
intermediate hosts. More specific names are applied to mamma- 
lian hosts. 
6. Reservoir hosts are not listed on the charts, but in cases 
where man is an accidental or abnormal host, the common 
hosts are indicated. 
7. No general references are listed since the material incorpo- 
rated into the charts is commonly found in most parasitology 
textbooks. However, where necessary, specific references 
have been included. 
