the body diameter, the longest being not more than equal to the
diameter of the sphere. The body inside of the gelatinous covering
is thickly coated with bright yellow cells similar to those
on Radiolaria. The animal moves slowly along with a rolling
motion similar to that described by Pènard '90, in the case of
_Acanthocystis_. Diameter of entire globe 35µ; of the body without
the jelly 18µ. The extremely fine granular pseudopodia are 8 to 35µ
long. Common among algæ.

This form was probably meant by Peck '95, when be figured "a
heliozoön."


[Illustration: Fig. 6.--_Heterophrys myriapoda_.]


KEY TO ORDERS OF FLAGELLIDIA.

Small, body usually amoeboid; 1 or more Order MONADIDA.
flagella; no mouth

Small; plasmic collar around the Order CHOANOFLAGELLIDA.
flagellum

With 2 or more flagella; one trails Order HETEROMASTIGIDA.
behind

With 3 or more flagella, none of which Order POLYMASTIGIDA.
trails