120 
F. Cavers. 
genera just mentioned is replaced by a canal which leads into the 
interior of the protoplast; in some species this canal is quite short, 
in others it extends for about half the length of the body. In most 
species of Cryptomonas the assimilate is like that found in Crypto- 
Fig. 7. Cryptomonads (1 to 9) and Ph^iocapsace^: (10 to 19) :— 
1, Protoclirysis phceophycearum Pascher. 2, Cryptochrysis commutata Pascher. 
3, 4, Wysotzkia biciliata (Wys.) Lemmerm. : 3, ordinary form ; 4, metabolic 
(amoeboid) form, showing protrusion of pseudopodia anteriorly and posteriorly. 
5 to 7, Cryptomonas erosa Ehrb. : 5, ordinary motile cell; 6, two encysted cells 
with gelatinous envelopes; 7, ruptured cyst membrane. 8, Chilomonas 
Parametrium Ehrb. : the flagella arise on the ventral side of the “ gullet ” 
(which shows several circles of granular markings in its lower half), from a 
small body which is connected with the nucleus by means of a long fibril. 
9, Cyathomonas truncata (From.) Fresen. : structure essentially as in Chilomonas ; 
there are numerous food vacuoles at the base of the cell, the single contractile 
vacuole is seen near the opening of the “ gullet.” 10 to 12, Phceoplax marina 
(Reinisch) Pascher: 10, motile cell ; 11 and 12, young colonies (beginning of 
palmella stage, which when fully developed resembles that seen in Chromulina 
Rosanoffii , Fig. 5, .9). 13 to 15, Phaocystis Poucheti Lagerh.: 13, gelatious colony 
(palmella state); 14, a portion of same, more highly magnified) ; 15, a motile 
cell (zoogonidium). 16 to 19, Nageliella flagellifera Correns : 11 and 12, one-celled 
and three-celled stages in development of colony, showing the perisarc and 
bristles ; 18, a single cell, showing the bell-shaped chromatophores ; 19 a 
motile cell (zoogonidium). 
1, 2, from Pascher; 3, 4, from Wysotzki ; 5 to 7, from Senn ; 8, 9, from 
Ulehla (with some details inserted from Hartmann and Chagos); 10 to 12, 
from Reinisch ; 13, 14, from Lagerheim ; 15, from Pouchet; 16 to 19, from 
Correns. 
