Cytology of Polyp hagus Euglenae . 197 
to the Mucoriaceae. In its general structure and in the formation of 
chromidia it also shows some connexion with the Protozoa. 
11. In Polyphagus we can clearly see the dual nature of the nucleus in 
that the larger part of the chromatin contained in it is definitely extruded 
for purposes of metabolism, only a small part being left for nuclear division 
and reproduction. 
12. The double fusion in Polyphagus , consisting of a chromidial fusion 
in the zygote followed by nuclear fusion in the sporangium, may afford 
some clue to the explanation of the delayed nuclear fusions and double 
nuclear fusions observed in the higher Fungi. This is briefly discussed. 
List of Papers. 
Atkinson, G. F. : Some Problems in the Evolution of the Lower Fungi. Annales Mycologici, 
vol. vii, 1909. 
Bail, Th. : Mycologische Berichte. Ill : Chytridium Euglenae. Bot. Zeit., vol. xiii, 1855, 
p. 678. 
Bally, W. : Cytologische Studien an Chytridineen. Jahrb. f. wiss. Botanik, vol. 1 , 191T. 
Barrett, J. T. : Development and Sexuality of some Species of Olpidiopsis , (Cornu) Fischer. 
Ann. Bot., vol. xxvi, 1912. 
de Bary, A. : Comp. Morph, and Biology of the Fungi, &c. Eng. Edit., 1887, p. 162. 
Berthold, G. : Studien fiber Protoplasmamechanik. Leipzig, 1886. 
Bott, K. : Ueber die Fortpflanzung von Pelomyxa palustris. Archiv f. Protistenkunde, vol. viii, 
I 9°7- 
Braun, A. : Ueber Chytridium. Monatsberichte der Berliner Akademie, 1855. 
: Ueber Chytridium, eine Gattung einzelliger Schmarotzergewachse. Abhandlungen 
der Berliner Akad., 1856. 
: Ueber einige neue Arten von Chytridium mit der damit verwandien Gattung 
Rhizidium. Monatsb. d. Berl. Akad., 1856. 
Busgen, M. : Die Entwicklung der Phycomycetensporangien. Pringsheim’s Jahrb. f. wiss. Botanik, 
vol. xiii, 1882. 
Dangeard, P. A. : Recherches sur la structure du Polyphagus Euglenae , Nowak. Le Botaniste, 
vol. vii, 1900. 
: Recherches histologiques sur les Champignons. Le Botaniste, vol. ii, 1890. 
: Structure et communications protoplasm iques dans le Bactridium flavum. Le 
Botaniste, vol. vii, 1900. 
Goldschmidt, R. : Die Chromidien der Protozoen. Archiv f. Protistenkunde, vol. v, 1904. 
Griggs, R. F. : Mitosis in Synchytrium. Bot. Gazette, vol. xlviii, 1909. 
: Some Aspects of Amitosis in Synchytrium. Bot. Gaz., vol. xlvii, 1909. 
— : Monochytrium : a New Genus of the Chytridiales, its Life History and Cytology. 
Ohio Nat., vol. x, 1910. 
Gros, G. : De l’embryogenie ascendante des especes on generation primitive, equivoque et spon- 
tanee et metamorphoses de certains animaux et v^getaux interieurs. Bull, de la Soc. Imp. 
des Sciences Nat. de Moscou, 1851. 
FIarper, R. A. : Cell Division in Sporangia and Asci. Ann. Bot., vol. xiii, 1899. 
: Sexual Reproduction in Pyronema confluens ) &c. Ann. Bot., vol. xiv, 1900. 
