PLATE IV 



MICROPHOTOGRAPHS OF NEMATODE, ALG^E, AND LOUSE 



FIGURE 13. Part of the field of the microscope under a low power, showing many 

 kinds of organisms. The largest is a Nematode of the commonest Antarctic kind. 

 The pear-shaped pharynx can be seen. There is a Water- bear and the cast skin 

 of another, a contracted Rotifer, and some Algae in round colonies. Near the 

 upper right-hand corner is a large egg, which is probably that otHydatina senta. 

 (Photograph by Mawson.) 



FIGURE 14. Fine filamentous Alga from Pony Lake. This is probably an Oscillatoria, 

 but is different from the kind most commonly found in the other lakes. 



FIGURE 15. A short rod of the common blue-green Alga (probably Oscillatoria), 

 highly magnified. Beside it are some narrower filaments of another kind. 



FIGURE 16. Photograph from life of the only parasite which we obtained from the 

 feathers of Antarctic birds. Two examples were got on a Skua Gull (Megalestris 

 Maccormicki). Though not so purely microscopic as the other animals photo- 

 graphed, it is a very small species. 



