964 D. WARD CUTLER 
strong fluid as modified by Gatenby. u.1.H, = Heidenhain’s iron-alum 
haematoxylin. D.u. = Dobell’s iron-alum haematein. The lettering of the 
figures is as follows: B.G.= basal granules. ©.B. = chromatin blocks. 
c.BL. = centroblepharoplast. c.1.= cell inclusions. ¥.B.=food bodies, 
N. = nucleolus-like body. s.R.=striations. s,T. = suspensory threads. 
Fig. 1.—Stained preparation of Pseudotrichonympha pristina 
showing ‘ resting’ nucleus, striations with basal granules, food particles 
behind the nucleus. x 3800; S.A. (D.J.), H.1.H. 
Fig. 2.—Posterior region of animal with triangular-shaped collection of 
granules. Note the region without flagella. 950; s.A., HLH. 
Fig. 3.—Anterior region of P. pristina with centroblepharoplast, from 
which arise the two threads running to the nuclear membrane. x 950 ; 
ScAu (Dida) BRL 
Fig. 4.—Portion of a section through body of the animal, showing the 
ridges (striations) under which are situated the basal granules, the origin 
of the flagella. x300; Fl. (Gat.), H.1.H. 
Fig. 5.—Centroblepharoplast of P. pristina with the threads and 
basal granules from which the anterior flagella spring. 1,000; s.a. 
(Did:); H.1.H. 
Fig. 6.—Posterior region of the body, showing the basal granules and 
flagella. The endoplasm contains unidentified cell inclusions. x 1,000 ; 
Fl. (Gat.), H.1.H. 
Fig. 7.—Top view of a late phase in the division of P. pristina, 
the centroblepharoplasts are situated at either side of the body with the 
dividing nucleus between them. Note the absence of any division centre. 
x 950; S.A. (D.J.), D.H. 
