G2 » al 4 - i , 
‘4 ; : 2 : oat _ v tg 
= ag? 7 i, <a as 
i 
. a 
= Ya 
1 
. 
@ 
! ; 
® 
? 
. 
PLATE 19. 
Fig. 11.—Ventral view of Heterodinium whittingae. X 420. ap? p., apical 
pore; fl. p., flagellar pore; J. f., longitudinal furrow; v. a., 
ventral area; v. p., ventral pit. 
Fig. 12.—Dorsal view of same. X 420. 
Fig. 13.—View of right side of same. X 420. 
Fig. 14.—Optical section at girdle of same. X 420. 
Fig. 15.—Ventral view of H. sphaeroideum. 1500. 
‘, 
{368 | 
