330 



C. ISHIKAWA. 



Explanation of Plates, XI-XIV. 



a — avclioplasm. 



a sj; — archoplasmic spiudle. 



cf — central fibi'es. 



n — nucleus. 



rf — radial fi]:)res. 



t — tentacle. 



.1' — median part of the archoplasmic 



spindle left after the division of 



the nucleus. 



-^ X Z -— Drawn l)y means of camera lucida under Zeiss' objective B with eye- 

 piece 2 : magnified 60 diameters. 



-jjj- X S = Drawn by means of camera lucida under Seibert's objective III with 

 eye-piece 1 : magnified 120 diameters. 



-ji — X Z := Drawn by means of camera lucida under Zeiss' homegeneous immer- 

 sion Vi2 with eye-piece 1 : magnified 350 diameters. 



-Yi — X Z '-=-- Drawn by means of camera lucida under Zeiss' homegeneous immer- 



/l2 



sion V]2 witli eye-piece 4 : magnified G50 diameters. 



Plate XI. 



(7)/r/.y/o» of the aiiiiiial.) 



Fig. 1. Individual preparing to divide; tentacle (/) much reduced in size ; 

 archoplasm (a) very plainly visible as a granular spherical body lying close to the 

 nucleus (n). Killed with Flemming's stronger fluid, and stained with Böhmer's 

 hiematoxylin. 



Fig. 2. Another individual of about the same stage as that of fig. 1 ; in 

 centre of archoplasm a ceutrosome surrounded by clear space. Similarly treated 

 as above. 



Fig. 3. Central plasm of a dividhig individual with archoplasmic spiudle 

 {(( s/>) lying close to the nucleus ; chromosomes gathered towards pole of iiucleus 



