136 



HA RD WICKE' S S CIENCE- G SSIP. 



suited for the observation of cyclosis (circulation of 

 the protoplasm), in which the;nucleus, granules, and 

 corpuscles are seen to participate. 



in shape, the anterior part hooked over or beaked, 

 and here the protoplasm is thinner. The myophan 

 layer of the ectosarc is well developed and seen by 



-^^" 



d> 







Fig. 82.— a Paramecium \bursana ; my, myophan striation ; b, Bursaria vernalis ; m, mouth ; /, ood (diatom) ; «, nucleus : 



c, chlorophyll corpuscles : v, contractile space. 



Fig. 83. — a, Ckilodon cucullus front view; n, nucleus; rs. red spot; d, diatom; ph, pharynx; my, myophan striation; 

 v, contractile space ; — b, ditto, side view ; c, ditto, with long vacuole containing diatoms ; d, nucleus, high power ; e, myophan 

 striation ; /, granules of endosarc, showing Brownian movements. 



18. Chilodon cucuttus (Fig. 83) is a very common 

 species. It is of fair size though not so large as the 

 preceding, and varies from about the thousandth to 

 thelone hundred and fiftieth of an inch. It is oval 



slightly altering the focus. The appearance then 

 presented (Fig. 83 e) is called myophan striation. 

 We have here the essentially contractile or function- 

 ally muscular layer of the ectosarc. By careful 



