1919] Rhodes: Binary Fission in Collodictyon triciHatum Carter 255 



6. The spindle is intranuclear. There are seven or eight chromo- 

 somes which part transversely at the metaphase. 



7. Growth of chromatin is very rapid in the anaphase. As the 

 chromatin passes to the poles of the spindle, a distinct granular 

 spireme is organized. 



8. Collodictyon conforms to no category in the classification of 

 mitoses of either Chatton (1910) or Alexeieff (1913). Its nuclear 

 membrane is persistent and its centrosome extranuclear. A typical 

 paradesmose is present. The chromosomes are organized from both 

 peripheral chromatin and the karyosome. 



9. Collodictyon is one of the simplest of the Polymastigotes, both 

 in morphology and mitotic phenomena. 



10. The blepharoplast consists of two basal granules, surrounded 

 by a granular archoplasm. In the middle of the prophase these 

 granules separate and divide into four, thus producing a double 

 blepharoplast for each daughter cell. The flagella either split or grow 

 out anew. The rhizoplasts split longitudinally, being doubled about 

 the time the basal granules separate. 



11. Division finally takes place by a longitudinal constriction along 

 the sulcus. 



ALEXEIEFF, A. 



1911o. La morphologic et la division de Bodo caudatus. C.-K. Soc. Biol., Paris, 



70, 130-32, 11 figs, in text. 

 1911b. Sur la division nucleaire et 1 'enkystement chez quelques Amebes du 



groupe Limax. Ibid., 70, 455-457. 

 1912a. Sur la stade flagelle dans 1'evolution des Amebes Limax. I, Stade 



flagelle chez Amoeba punctata Dangeard. Ibid., 72, 126-128. 

 1912&. Sur les characteres cytologique et la syst&natique des amebes du 



groupe Limax (Naegleria nov. gen. et Hartmannia nov. gen.) et des 



Amebes parasites des vertebres (Proctamoeba nov. gen.). Bull. 



Soc. Zool. France, 37, 55-74, 7 figs, in text. 

 1913. Systematisation de la mitose dite "primitive." Arch. f. Prot., 29, 



344-363, 7 figs, in text; 



1916. Protozoenstudien II. Ibid., 36, 241-302, pis. 13-21, 5 figs, in text. 

 BLOCHMANN, F. 



1895. Die microskopische Thierwelt des Siisswassers. 1. Abt., Protozoa. 



(Hamburg, Grafe), xv + 134 pp., 7 pis., 10 figs, in text. 

 BOECK, W. C. 



1917. Mitosis in Giardia microti. Univ. Calif. Publ. Zool., 18, 1-26, pi. 1, 



1 fig. in text. 



