JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XXIII, 



Illustrating Professor Ray Lankester's " Description of 

 Lithamoeba discus, nov. gen. et sp,, one of the Gym- 

 nomyxa." 



Fig 1. — Lithamceba discus at rest ; magniBed about 350 dinmeters, n. 

 nucleus ; cone, concretions ; /. food matters ; cv. contractile vacuole. 



Fig. 2. — The same specimen actively extruding pseudopodia. 



Fig. 3.— Another specimen (less magnified) killed by iodine solution. 



Fig. 4. — The vacuolar structure of the protoplasm, as seen under No. 

 10 immersion lens, in a specimen treated with osmic acid and picro-carmine. 



Fig. 5. — The angular nucleus and its investing membrane after the 

 action of dilute acetic acid. 



Fig. 6. — The granular cuticle in optical section, after the action of 

 iodine solution. 



Fig. 7. — The granular cuticle, surface view, after the action of iodine 

 solution. 

 Fig. 8.— a concretion isolated. 



