54 



PROTOZOA 



formed in the cytoplasm in the neighbourhood of the nucleus, 

 and connected by chitinous cement. Among these Quadruli 

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



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

 fission and gemmation ; 3, resolution 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-nagellate 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 Paulinella 1 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 Cyphoderia (Filosa), the plates are merely chiti- 



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

 biotic Cyanophyceous Algae. 



