ISO 



PROTOZOA 



wa'l massive, ihc terminal oixminc; llie only communication witli (lie exterior. 

 Miliold (liL,'. lU)- B. Peri'orata. Slieli perforated by many pores; terminal 

 opening mav he lacking. PolviloDiclla, Kolalia (fig. iiS), bottom dwelling; 

 Glohigcriiia hulloiJcs (fig. 130), pelagic. Among the fossils the Xummulites 

 need mention. 



Possibly the XEXOPHYOPHORA of the deep seas belong near the For 

 aminifera. These are large biconcave discs or fan-like plates 2 to 7 cm. across, 

 formed of delicate tubes, sometimes arranged in a network, sometimes branched 

 like antlers, and between them a skeleton of foreign bodies, the 'xcnophya.' 

 The fine tubes [graiicUan:) are filled with a polynucleate protoplasm; the larger 

 tubes {stcrcoiiiort) contain large balls, interpretatcd as fxcal. The animals 

 have not been sludied in the living condition. 



Order VI. Mycetozoa (Myxomycetes). 



The Mvcctozoa or slime animals are regarded by some as animals, by others as 

 plants (slime moulds). The first view is supported by the structure of the motile 

 stage, the plasiiiodium. the second by the repjroductive bodies, resembling these 

 of manv fungi. The plasmodia appear in damp weather as networks of bright- 

 red, orange or vellow slime on decaying wood. They are gianl Aniad.\T of 

 reticulate protoplasm several centimeters in extent, containing many nuclei and 



Fig 



m^m 





Fig. i: 



Fig. 132. — Clrindriodcrma illffonnc (after Strasburgcr). a, dry spore; h, 

 in water; c, spore \\"ith escaping contents; </, zoospore; c, an\a'lioiii niodif^e 

 zoospores which are uniting to form a plasniudliun; /', pari of a ^ilasmodiuni; in 

 niulei and contractile vacuoles. 



l''ii'.. i;,;,. — S]iore-sacs of .Ircvr/u incayinila (after dc ParyV .Vt the left (he 

 giuni ru|Uured b\" the e-\pani.ling eapiUilimn, wliich has discharged the spores. 



swollen 

 iition of 

 (/ and c, 



sporan- 



much foreign mailer taken as food. They creep slowly bv means of pseu- 

 do[:)odia (lig. 13J, /). On drying, the jilasmodiuni encysts in a peculiar manner, 

 and forms the reproductive boches, the sporangia (fig. 133) and the ' carpomc.' 

 These are firm-walled vesicles, frequently slalkt^d, the stalk sometimes extending 

 into the axis of the sporangium as a cohimcUa. The space between the wall of 

 the sporangium and the columella is filled with fine ]iowderv spores and an 

 exploding apparatus, either a network of fine filaments {capillitiiiiii) or many 



