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Annals New York Academy of Sciences 



Dinobryons: Dinohryon utricidiis (figure 1), have a lorica which is very rich 

 in pectin, and made up of small elliptical scales, imbricated in helicoidal series. 

 This structure presages the one which appears in the Synura and the Mallo- 

 monas. 



Figure 1. Loricae after Bourrelly, 1957. 1: Dinohryon cylindncum var. pahistre; 2: 

 Dinohryon sp.; 3: Lagynion Janei; 4: Dinohryon siiecicuin; 5: Ilyalohryon ramosiim; 6: H. 

 Borgei; 7: Dinohryon utriculiis; 8: D. sertularia; 9: D. divergens (1, 8, 9: after staining). 



O CD 



Figure 2. Loricae of Clirysococcus (after Bourrelly). 1: Chrysococcus rufescens; 2: 

 C. tesselatus; 3: C. ovoides; 4: C. elegans; 5: C. umhonatus; 6: C. porifer; 7: C. minutus; 8: C. 

 rufescens var. compressa; 9: C. cordiformis; 10: C. rufescens fo. tripora; 11: C. dokidophonts; 

 12: C. radians; 13: C. 6we/!w; 14: C. spinosus; 15: C. klehsianus; 16: C. heverlensis; 17: C. 

 ornatus; 18: ('. areolatus; 19: C scidptus. 



Finally, a genus very close to Diuobryon: Hyalobryon (figure 1) is charac- 

 terized by its very long lorica, cellulose-pectic, formed by pieces of encased 

 cylindrical tubes, of unequal length, the widest one being the one at the base, 

 and the narrowest one being at the top, presenting a flagellate opening. 



