II 



PHYLUM PROTOZOA 



91 



protoplasm, while the outer portion is tolerably firm and resistant. 

 When partially retracted, a spiral ridge is sometimes observable 



C-i/ac 



l.Podobhrya 



2. A c i n e ^ a 



6. S phoer o (shrya 



7,0bhryodendron 



S.Epholofa 



9. DendroGoma 



Fio. 67. Various forms of Tentaculifera. 7 anil /., two sjiL-cifs of Podophrya; c, a 

 tentacle much enlarged; 2a, Acineta jolyi ; 2l>, A. tuberosa ; in '/' tin' animal lias captured 

 several small Cilia ta ; Sn, a specimen multiplying b}- budding ; \/\ a fivr ciliated i'u>l ; :'/. tin- 

 entire colony ; 96, a portion of the stem ; 9c, a liberated hud: ", urg.tniMM i-a]>tmvd as 

 6. e. brood-cavity ; ini. bud: r rue. contractile vacuole ; )/;;/. /!<(. meganucleus ; mi. nu. micro- 

 nucleus ; t. tentacle. (After Biitschli and Saville Kent.) 



around the tentacle : this may indicate the presence of a band of 

 specially contractile protoplasm, resembling the axial fibre in the 



