6 



BRANCH PROTOZOA. 



FIG. 9. 



FIG. 10. 



a most beautiful golden sheen. This is not the only 



form, however, which can lighten 

 up the sea ; many other Protozo- 

 ans, as well as certain individu- 

 als of every other branch, have 

 a like power. 



The Noctiluca not only multi- 

 plies by fission, but may draw 

 in its flagel- 

 lum, lose its 

 mouth and be- 

 come a mere sphere of protoplasm, a 

 cyst (stst). After resting encysted for 

 some time, the cyst breaks open and a 

 multitude of minute Noctilucse hasten 

 forth. This phenomenon, which has 

 also been observed in some Rhizopods, 

 is called " multiplication by the forma- 

 tion of zoospores " (zo'o sporz). 



Noc tilu'ca mil i a'ris. (Magnified.) 



Po 



ORDER CILIATA (sil i a'ta). 







a 



The Ciliate Infusoria have not the 

 long flagella of the previous order, but 

 are very generally provided with nu- 

 merous small cilia which serve as or- 

 gans of locomotion ; though, around 

 an opening, which answers for a mouth, 

 the cilia may be of larger size and of 

 use in securing and retaining food. 



The Paramoecium (par a me'si um), 

 is a very common form, found in stale water, while often 

 attached to the stems of aquatic plants are colonies of 



ParanuK'cium cauda'tum. 

 The arrows indicate the di- 

 rection of the current in- 

 duced by the action of the 

 cilia. O, The course the 

 food takes on entering the 

 body substance. , Mat- 

 ter no longer containing 

 nutriment being thrust 

 from the body. /, Food 

 mass. N, Nucleus. Pv', 

 Pulsating vesicle imme- 

 diately before and Pv, 

 immediately after con- 

 traction. (Greatly en- 

 larged.) 



