54 



TROTOZOA 



foi'ined ill the cytoplasm in tlie neigliboiirhood of tlie nucleus, 

 and connected by chitinous cement. Among these Qtcadrula 

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



Fig. 9. — Trichos])haerium sieboldii. 1, Adult of -'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-rtagellate zoospores or (exogametes) ; 8, liberation of gametes ; 9, 10, more highly 

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

 " A" form. (After Schaudinn.) 



p. 29), and Paulinella'^ 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 otlier genera 

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



^ This genus contains two sausage-shaperi, blueibh-green plastids, possibly sym- 

 biotic Cyanophyceous Algae. 



