470 JIK. H. SANDON ON PROTOZOA FROM THE 
Amceha actinophora Auerb. — This organism, as it appeared in the cultures, 
agreed closely with the figures and description of A. actinojy/ioi'a given by 
( ;ash, but the envelope was much less well defined than in those figured by 
Penard (22) under the name o£ CocJdiopodium actinopJwrum. The usual 
appearance is of a small granular amceba completely surrounded by a wide 
ectoplasmal border except during the extrusion of fpecal matter, when the 
granular endoplasm extends to the surface at the hinder end. In this con- 
dition it changes shape quickly or moves forward slowly, the appearance 
being somewhat like that of a broad limax except for the wide clear border 
of ectoplasm. The anterior end is wider than the posterior, and the con- 
tractile vacuole is anterior. At other times progression ceases, and long, 
pointed pseudopodia arise from the endoplasm, which projects right through 
the ectoplasm. The length of the amoeba varies from 24 /a to 36 /i, and the 
pseudopodia may reach about 15 /x in length. 
Corycia flava Greef. — Though empty, rolled-up tests probably belonging 
to this species were observed in many of the moss samples, living specimens 
occurred in only two (one from each locality). They were quite typical 
and the size was about 135 fi. 
Several specimens of Corycia coronala var. simplex (Penard), which is now 
generally regarded as a variety of C. flava (32), occurred in one of the other 
samples from Klaas Billen ^^j- Diameter of shell 105 /x to 120 /i. 
Difflugia. — As in Scourfield's and Pen;ird\s samples, I), constricta Ehrenb. 
was much the commonest testaceous rhizopod found. The numerous speci- 
mens recorded as D. globulus Duj. were all empty tests, and it is therefore 
impossible to be sure whether they belonged to this species or to the genus 
Phrr/ganella Penard, as the two are distinguishable only by the form of the 
pseudopodia. The diameter was usually betvveen 33 yu. and 50 /i, but in one 
sample very large specimens (diameter 120 ytt) were found which were more 
probably tests of Pliryganella nidulus Penard. D. fallax Penard was also 
very common. The size u as generally about GO fx, in length by 54 /x in greatest 
width, with an aperture of between 25 f.i and 30 yx. The smallest individual 
recorded was 30 /i long and the largest li jjl. 
I), lucida Penard, the scarcest of the Difflugias found, occurred in only 
one sample. The size was usually about 54 /a in length by 27 fi in greatest 
width. One specimen reached a length of 80 fi. 
D. pyriformis Perty was not common, and varied from 87 /i to 105 /a in 
length. 
Centropyxis. — Although the two species of this genus were about equally 
widely distributed among the samples, the individuals of C. kccigata Penard 
were considerably the more numerous. They were mostly rather small speci- 
mens, the diameter of the shell usually lying between 60yit and 80 /i, with a 
height of 45 /A to 60/* and an aperture of from 25 /i to 45 /a in diameter. 
A single very large specimen (144 /x in diameter and 72 /x in height) was 
