66 



ZOOLOGY 



SECT. 



the latter (B, a, b, c) it consists of a mass of protoplasm with a number of 

 nuclei surrounded by a laminated wall of cellulose the substance character- 

 istic of the cell-wall of the typical plant-cell (p. 17). In the protoplasm 

 are numerous non-nucleated protoplasmic bodies or chromatophores, con- 

 taining chlorophyll and a yellowish -brown colouring matter in varying 

 proportions. There are also a number of minute rounded bodies of a bluish 

 tint probably composed of reserve food-materials. In the young condition 



i,i- 



.'.. 



- 



, , 



B 



g\m. : '? M 



&.('&^Wjes!M-& 

 m^^iST'-^ 



, x ^yjSlMSSji 



^ ' : | ' 



.' ^SKir' 1 



TV 



^. .- '-p)iH' 



J^^ -A ' ':sWf ; ^>W -<--^sas^ 

 /V>/ '.'!:--"-. C f ^5 



?^" ., ' -' r^-i- 1 , "" i 



m'T^F Jt ^ ^^ Xa labyrmthuloides. ^, active phase ; c.w. cell-wall ; /. frag- 

 ment of Alga ingested as food ; sp. spindles in course of pseudopods ; B, resttag-fitagfr- 

 pn^IT md {^ d " als i n the c . e s of a fragment of Sphagnum; a, specimen completely 

 enclosed in cell ; 6 and c, specimens which have emerged through the ruptured cell-wall 

 C, specimen multiplying by budding ; D, by binary fission ; E, by internal fission may 

 represent a stage m spore-formation. (A after Archer, BE after Geddes.) 



(a) the resting cells are globular and microscopic, lying enclosed within the 

 cells of the Sphagnum, but as they grow in this confined space they become 

 elongated and irregular, and finally burst through the wall of the moss-cell, 

 forming masses (b, c) quite visible to the naked eye. These may bud (C) or 

 undergo binary fission (D) ; or the protoplasm, retreating from the cell-wall, 

 may divide into numerous small uninucleated aimcboid masses, each of which 

 subsequently surrounds itself with a new cell-wall (E). 



