ox CRISTISriEA VENERIS NOV. SPEC. 541 



Fig. 7. — Middle region of an individual which is opening out after 

 incurvation. Division of body and crista is seen. (Osmic vapour 

 30 sees., absolute alcohol, Giemsa.) 



Fig. 8. — Part of the body of an organism which has been fixed by 

 exposure for several minutes to osmic vapour, then treated with absolute 

 alcohol, stained with Giemsa, and differentiated in alcohol. At a the 

 dark blue granules are distinctly seen ; at h is seen a thickened partition. 



Fig. 9. — Part of another organism, treated like the preceding, but 

 more deeply stained. The granules are not sharply differentiated from 

 the walls of the chambers. At two points new chambers are being 

 formed. 



Fig. 10. — Part of a dried organism fixed in absolute alcohol and 

 stained with Giemsa. " Nuclear "' structures in the form of a spiral or 

 zig-zag filament (a), a transverse bar (6), granules (c), a tetrad {d), etc., 

 are seen. 



