Bourrelly: Loricae & Cysts in Chrysophyceae 



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vallalum), (2) helicoidal protruding excrescence (Ps. Klarnelii, Ps. pseudo- 

 spirale (figure 3)), (3) regular cross checks {Ps. ovum, Ps. ornatum (figure 

 3)), (4) longitudinally projecting sides {Ps. formosissimuni (figure 3)). 

 The same remarks may be applied to the genus Kephyriou (figure 4) in 

 which we note the same diversity in the form of the small cells, but a smaller 

 variety in the ornamentation of the walls. 



In the genus Lagynion (figure 5), the cells do not have flagella, but have 

 more or less ramified pseudopoda issuing from the oral pole. This genus with 



Figure 5. Loricae of Lagynion (after Bourrelly). \: fiihiim; 2: oblongum; 3: arachne; 

 4: rliizopodicHm; 5: notostomum; 6-7 : rednctiim; %-\\: Seller ffelii; \2:ampullaceiim; 13-15: sub- 

 ovaium; 16 and 18: maerotraehehim; 17: triangularis; 19 and 20: triangularis var. pyramida- 

 tiim; 21-23: reflexiini; 24: sphagnieolum; 25: vasieola; 26: Janei; 27-28: cystodinii; 29: globosum 

 var. undidatum. 



calcified pectic lorica does not show any characteristic ornamentation, the 

 lorica is always brown or yellow, thickened, finely granulated. The forms are 

 highly varied and the evolutive process comes to bear on the neck terminating 

 the lorica. In some species {Lagynion Janei (figure 5), for example), the 

 wall of the theca is double, the inside is thin and hyaline, the outside brown, 

 thick and calcified. This structure is found in the Diploeca series among the 

 Craspedomonadines, a large group of collared flagellates related to the Chryso- 

 phyceae. 



In the family of the Stylococcaceae, we note a large variation in the form of 

 the loricae: along with sessile loricae, there are genera with pediculate shells 

 {R/iizasler, Slylococcus). We also find genera in which the thecae show numer- 



