ir. SPOMOZOA: SU2IMART OF IMPORTANT FACTS. 219 



the Protozoa into the classes Rhizoijoda, FlageUata, C'iliata, auci 

 Sporozoa. 



8. The Ehtzopoda have changeable jwotoplasmic processes, 

 the pseudopodia. 



9. The Ehizopoda are subdivided into Monera, Lobosa, Ilelio- 

 zoa, Eadiolaria, Foraminifera, and Myeetozoa. 



10. The Lol'osa and Monera have no definite shape. The 

 Lobosa have a nucleus, the Monera are anucleate. 



11. Heliozoa and Eadiolaria are spherical and have fine radiat- 

 ing pseudopodia and frequentlj' silicious skeletons. They are dis- 

 tinguished by the occurrence of a central capsule in the Eadiolaria 

 which is lacking in the Heliozoa. 



12. The Thalannopliora (Foraminifera) have a shell, closed at 

 one end, at the other with opening for the extension of pseudopodia. 

 The shell is chitinous or calcareous, one or several chambered, 

 straight or spiral, sometimes with close walls, sometimes perforated 

 with pores; the i^seudopodia are occasionally lobular, but usually 

 filiform, branching and anastomosing. 



13. The Foraminifera are of great geological importance on 

 account of their numbers and their shells, which have built and 

 are still building extensive Ijeds of rock (chalk, nummulitic lime- 

 stone). The silicious skeletons of the Eadiolaria are less important. 



14-. j\[ycetozoa (Myxomycetes of botanists) are mostly enormous 

 Amosbaj with branched reticulate protoplasm (plasmodium). They 

 form comjjlex reproductive structures (sporangia, etc.), recalling 

 those of the fungi. 



15. Flagellata have one or a few long vibratile processes — 

 flagella — which serve for loconiotion and for the taking of food. 



10. The Autoflagellata have only flagella; they feed like plants 

 (Volvocina) by means of chloroijhyl, or have a mouth for the tak- 

 ing of food, or a collar (Choanoflagellata). 



17. The Dinoflagellata have two kinds of flagella and usually 

 an armor of cellulose. 



18. The Ciistoflugellata have a gelatinous body enclosed in a 

 firm membrane {Noctiluca). 



19. The CiLiATA (IxFUSOKiA in the narrower sense) have 

 numerous slender vibrating processes, the cilia, a cuticle, and hence 

 fixed openings for the ingestion of food (cytostome) and for extru- 

 sion of indigestible matter (cytopyge). 



21. Of great interest is the occurrence of two kinds of nuclei, 

 a functional nucleus (macronucleus) and a sexual nucleus (micro- 

 nucleus, jiaranucleus). 



