I PHYLUM PROTOZOA 41 



transverse lines or striations ; and a second flagellum, of 

 comparatively small size, lies in the gullet. 



Though all the Mastigophora are characterised by the 

 possession of flagella, there are a few, such as Mastigamotba 

 (Fig. 13, 4\ which also possess pseudopodia, and may be 

 capable of amoeboid movements. 



Nutrition is effected in a variety of different ways. Some 

 forms live in decaying organic infusions, not taking in solid 



m f 



FIG. 16. Noctiluca miliaris. a. the adult animal ; l>, c. flagellulae ; bg\ tentacle. 

 f. flagellum ; HI. mouth ; n. nucleus. (From Lang, after Biitschli.) 



food-particles, but absorbing nourishing matter in a dis- 

 solved form from the substances in the infusion. Others, 

 living in internal cavities of the bodies of higher animals, 

 receive, in a similar way, nourishment from the juices of the 

 animal they infest. Organisms, whether plants or animals, 

 which receive their nourishment in the former of these two 

 ways, are said to be saprophytic as regards their nutrition, 

 while such as obtain it from other living organisms are said to 

 be parasitic. But a large proportion of the Mastigophora are 

 neither saprophytes nor parasites, and are nourished in one 



