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22. 
EXPLANATION OF PLATE 10 AND TEXT-FIGURES. 
All the figures are drawn from fixed and stained preparations. The 
optical apparatus employed was as follows: Zeiss apochromatic oil- 
immersion objective 2mm, (N.A. 1-3), and compensating oculars 4, 6, 
12, 18. Critical illumination was always employed. The method of 
fixing and staining, and the approximate magnification is given below 
in the case of each figure. The following abbreviations are employed : 
s.A. =Schaudinn’s sublimate-aleohol mixture. s.a. (D.J.) =Schaudinn’s 
sublimate alcohol as modified by Dobell and Jepps. Fl. (Gat.) = Fleming’s 
