54 



PROTOZOA 



formed in the cytoplasm in the neighbourhood of the nucleus, 

 and connected by chitinous cement. Among these Quadrula 

 (Fig. 10, A) is Lobose, with square plates, Euglyioha (Fig. 8, 







Fig. 9. — Trichosphaerium sieboldii. 1, Adult of ''A" form; 2, its multiplication by 

 fission and gemmation ; 3, resolntion into 1 -nucleate amoeboid zoospores ; 4, 

 development (from zoospores of "A") into "B" form (5) ; 6, its multiplication by 

 fission and gemmation ; 7, its resolution after nuclear bipartition into minute 

 2-flagellate zoospores or (exogametes) ; 8, liberation of gametes ; 9, 10, more highly 

 magnified pairing of gametes of different origin; 11, 12, zygote developing into 

 "A" form. (After Schaudinn.) 



p. 29), and Faulinella''- are Filose, with hexagonal plates. In 



the latter they are in five longitudinal rows, with a pentagonal 



oral plate, perforated by the oval pylome. In other genera 



again, such as Cyplioderia (Filosa), the plates are merely chiti- 



^ This genus contains two sausage-shaped, blueish-green plastids, possibly sym- 

 biotic Cyanophyeeous Algae. 



