12 



when the plasmodia exhibit no trace of nuclei, the nuclear substance being 

 apparently distributed throughout the whole plasmodium. Subsequently 

 the plasmodium breaks up into a great number of minute spherical 

 spores. 1 



Pseudamphimonas, de Bruyne, was found on Caulerpa at Naples. The 

 zoospores are biflagellate and extremely amoeboid. They withdraw their 

 flagellae, and two or three have been seen to fuse together to form a 

 plasmodium. 



(I.) Bursulla, Sorokin, is found in horse-dung. A number of amoebulae 

 with long pointed pseudopodia unite to form a plasmodium. The 

 plasmodia contract and form either stalked cysts (51 /*,), the contents of 

 which divide and emerge as eight amoebulae, or they give rise to naked 

 spherical cysts with rosy contents and an outer cortex, from each of 

 which a single stalked zoospore emerges. 



GROUP E. 



The affinities of the genera included in this group are quite 

 obscure. 



(I.) Enteromyxa, Cienkowski, forms, by the fusion of amoeboid zoospores, 

 long vermiform plasmodia (O'5-l mm.) with short tubercular pseudopodia. 

 These break up into segments, which encyst and give rise to two or 

 seldom more amoeboid zoospores. It feeds on Oscillatoria. 



(I.) Endyonema, Zopf, forms cylindrical cysts of considerable length in 

 the threads of filamentous algae. Nuclei are said to occur previous to 

 cyst-formation. 



Ectobiella, de Bruyne (Fig. 1), was found in the form of a biflagel- 

 late pyriform zoospore. It attacks Licmophora and other diatoms, with- 

 draws the flagella and pushes a pseudopodium into the protoplasm of its 

 prey. When the contents of the diatom are assimilated, the amoeboid 

 organisms wander away and encyst. 



Haplococcus, Zopf, is found in the muscles of the pig. Two kinds of 

 cysts are described by Zopf, the zoocysts (1 6-22 /x) and the hypnocysts 

 (25-30 /A). The membrane surrounding the former is thinner in some 

 places than elsewhere, and from them escape six to fifteen amoeboid 

 spores. The further history of the hypnocysts has not been followed. 



Pseudosporidium, Zopf, was found by Brass in vegetable infusions. 

 It is amoeboid in form, with short blunt pseudopodia, a nucleus, and a 

 vacuole. The cysts give rise to numerous small flagellate zoospores. 



Schizogenes, Pouchet, was found in the haemocoel of freshwater Ostra- 

 cods and Copepods. It consists of small plastids of hyaline protoplasm, 

 01-'03 mm. without vacuoles or nucleus, of indefinite form, and devoid 

 of pseudopodia. It divides into parts, which become new individuals. 



BathybiuSj Huxley, and Protobathybius, Bessels, are no longer regarded 

 as living organisms. It seems probable that both forms represent a colloid 

 precipitate of calcium sulphate thrown down by the action of alcohol on 

 sea-water (Murray). 



1 See Note, p. 4. 



