34 F. Cavers. 
relative length where two or more are present) may afford a valuable 
clue to affinities. 
In 1899, Luther (90) described a new genus, Chlorosaccus (Fig. 
Fig. 1. CHLOROMONADINE.E (Flagellate and Transitional Heterokontae). 
A to C, Chloramceba heteromorpha Bohl. : A, a normal green individual, with 
nucleus, contractile vacuole, three chromatophores, and oil-drops; B, resting 
cyst; C, amoeboid colourless individual. D, E, Vacuolaria virescens Cienk. : 
E shows the anterior end more highly magnified, with two vacuoles and in¬ 
sertion of flagella in the gullet-like pit. F, Vacuolaria flagellata Senn. G, H, 
Chlorosaccus fluidus Luther ; G, portion of a colony; H, motile cell. J to V, 
Leuvenia natans Gardner ; J, a portion of the floating colony ; K, the same more 
highly magnified ; L, a motile cell soon after being set free; M, N, O, P, later 
stages showing amoeboid habit of the zoogonidia ; Q and R, zoogonidia with 
four and eight chromatophores respectively ; S, resting zoogonidium with the 
flagella withdrawn and with a cell-wall developed; a free floating colony 
showing the rapidly dividing chromatophores held together by protoplasmic 
threads; U, an earlier stage in development of colony, showing the ruptured 
cyst-wall at base ; V, section through a young colony showing the nuclei and 
the chromatophores in pairs. 
A—C from Bohlin ; D, E, from Senn; F, from Stokes; G, H, from 
Luther ; J—V, from Gardner. 
