100 



ZOOLOGY 



SECT. 



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

 When partially retracted, a spiral ridge is sometimes observable 



i.Rh/ncheta 



.0|>hryodenclron 



8.Et>helol'a 



9. Oendrosoma 



Fia. 70.— Various forms of Tentaculifera. la and &, two species of Podoy^hrya; c, a 

 tentacle mucli enlarged ; 3a, Acineta jolyi ; Sb, A. tuberosa ; in 6 the animal has captured 

 several small Ciliata ; 8a, a specimen multiplying by budding ; Sb, a free ciliated bud ; 9a, the 

 entire colony ; 9&, a portion of the stem ; 9c, a liberated bud ; a, organism captured as food ; 

 &,c. brood-cavity ; bd. bud ; r. vac contractile vacuole ; /. lorica ; mg. nu. nieganucleus ; 

 mi. nu, micronucleus ; t. tentacle. (After Btitschli and Saville Kent.) 



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

 specially contractile protoplasm, resembling the axial fibre in the 



