I. ( a ) A typical short form resembling that found in ft v i 
aborea (Plate XXVI, fig. io) is about 2 5/1 long, 9 n wide and has a 
flagellum 2.S// long. The blepharoplast is situated 2 3/z from the 
posterior extremity, and V2 M posterior to the nucleus. The nucleus 
is 9 M long. The chromatin was collected in masses at either end of 
the nucleus, or was diffusely distributed in fine granules throughout 
its extent. The cytoplasm is a rather loose network, and it seems 
to be continued into the undulating membrane. The side of the 
body carrying the undulating membrane thus appeared to be folded 
into a series of foot-like projections produced by the involutions of 
the thick and substantial membrane. 
This general description applies to the other tw-o forms. 
{b) The long form is characterised by its great length, 40 to 63/1 
not including flagellum which is from 19-2 to 26 n long (Plate XXV, 
figs. 6 and 7), its comparatively narrow body, between greatest 
projections 5 5 to 72//, and the appearance of folds or pleats running 
longitudinally ; this was especially marked at the posterior end. 
Sometimes the body is particularly thick and dark-stained. The 
length of the nucleus is 22 to 2 4/ u, and the width is 
(0 The wide form (Plate XXVI, fig. 9) looks like the narrow 
varieties, with the folds unfolded however. It measures as follows 
Measurement I ... 22'0/z 
Hlepharoplast is connected with the nucleus. 
22.0 /i 
19 0/1 
14-8/* 
63 -0/* 
membrane ^ haVe the thicken ed edge of the undulating 
membrane running about I* from the wavy edge of the body. * 
round^nuc eus was never found m any of these forms " 
, c ' . 16 la ” ceoIat e variety (Plate XXV, fig. c) 0 f T loricate 
gradLTly Tapers 6 to^ TTu P ° Sterior e *^mity, from which the body 
has smooth ed ? he pointed anterior extremity. The body 
is weTdeveloned , ^ The Undula ^ng membrane, 
the end of the \ ^ dlreCtIy backw ards and then curves aroU> ld 
The e i S ° 2 h i 0d ^ rUn T f ° ldS a, °^ the -clian line of the bod/- 
- in " 
I 
II 
Ill 
1 1 IV 
V 
1 otal body length 
