1892.] 



THE MICEOSCOPE. 



119 



A Beautiful Rliizopod — Clatlirulina elegaus. 



By CHAS. W. smiley, 



WASHINGTON, D. C. 



At the lowest point in the animal kingdom stand the protozoa. 

 Of these there are four classes: I, the Monera (without any or- 

 gans) ; II, the Rhizopoda (having a nucleus and outer layer of 

 sarcode) ; III, the Gregarinida (an ovate, animal parasite) ; and 

 iV, the Infusoria (having a definite shape and usually one or 

 more mouths), holding the highest place in the quartette. 



Explanation of Plate. 



Fig. I. — Clatlirulina Elegans, x 350. 



Fig. 2. — Enlargement (600 dia.) to sho-.vgroov- 

 ing of the outer surface of the latticed shell. 



Fig. 3. — An individual in which the prod- 

 ucts of the simple fissionof the protoplasmic 

 bodyjhave become encysted. 



I'lG. 4. — A product of fission with pseudopo- 

 dia withdrawn, globular, preparatory to en- 

 cystment (x 320.) 



Fig. 5. — A cyst covered with minute siliceous 



spinelets (x 600). 

 Fig. 6. — A zoospore with 2 flagella, nucleus 



(«) and 2 contractile vesicles (c). 

 Fig. 7.— A flagelulla which has lost its shape 



and become an amoebula. 

 Fig. 8. — A young specimen which has a stalk 



(j) but no shell yet, food vacuoles (z/ v) and 



contractile vesicle (c). 



