30 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



green cells, dividing in one or more directions, grouped in 

 twos or fours without order near the periphery. Isogamous 

 planogametes *. e., provided with cilia, biciliated zoogoni- 

 dia, and resting spores with thick brown cell walls, are de- 

 veloped. 



T. lubrica (Roth) Ag. var. lacanosa Chand., Fig. 212. 



T. gelatinosa (Vauch.) Desv., Fig. yy. 



[T. bullosa (Roth) Ag.] 



Apiocystis Nag. Thallus small, of various or changing 

 color, fastened by a stem-like base. Cells spherical, sometimes 

 scattered, sometimes eight in a circle; contents homogeneous 

 or slightly granular, with a distinct colorless vacuole. Propa- 

 gation by globose zodgonidia, each bearing two cilia, and 

 isogamous gametes. 



SUB-FAMILY III. PALMELLE^E. 



A large number of globose cells are aggregated in a struc- 

 tureless mass of jelly, which is of indefinite extent except in 

 Palmodactylon, in which it is more or less cylindrical and 

 variously branched. The outer layers of the firm, thin cell 

 walls are thrown off from time to time in one or many pieces. 



Description of Genera. 



Palmella Lyng. A shapeless mass of jelly, holding cells 

 which are spherical, oval, or oblong, green, red, or brown. 

 Multiplication by repeated division of the cell contents, accom- 

 panied by decided gelatinization of the wall of the mother-cell. 

 Reproduction by macro- and macro-zoogonidia and also by 

 small isogamous planogametes. 



P. mucosa Kiitz. ( ?) , Fig. 72. Fig. J2a is the gelatinous 

 colony, natural size. 



Schizochlamys A. Br. Found with Tetraspora, and like 

 it, except that in this genus the cell wall often splits into four 

 parts. The cell contents afterward divide into two or four 

 daughter-cells. 



Palmodactylon Nag. Small round cells, dull green, en- 

 closed in a cylindrical bladder-like membrane. Several of 

 these membranes are often joined together at one end, spread- 



