EXPLANATION OF THE PLATES. 



PLATE I. 



In this Plate is represented a series of typical forms of Rhizopoda, chiefly belonging to the Orders 



LoBosA and Radiolaria. 



Fig. 



1. — Aciinophrys sol, with its radiating pseudopodia; 

 V, contractile vesicle. (After Claparede.) 



2. — Actinophrys sol, in the act of engulphing a 

 Vorticella, a ; at v is seen the contractile 

 vesicle. {After Weston.) 



3. — Aciinophrys sol, in the act of nearly completed 

 self-division (or incipient conjugation ?) ; v, v, 

 two contractile vesicles. (After Weston.) 



4. — Actinophrys sol, in an earlier stage of self- 

 division (or more complete conjugation ?) ; 

 V, V, two contractile vesicles. (After Cla- 

 parede.) 



5. — Eughjpha alveolata. (After Dujardin.) 



6. — Plagiophrys cylindrica. (After Claparede.) 



T. — Central portion of Acanthometra tetracopa. 

 (After Miiller.) 



8. — Central portion of the siliceous framework of 

 Acanthometra echinoides ; a, furrowed entrance 

 to the canal of one of the rays. (After Cla- 

 parede.) 



0. — Haliomma hexacanthum. (After Miiller.) 

 10. — Sphcerozoum punctatum ; at a, a is seen the 

 gelatinous investment in which are imbedded 

 the spheroidal bodies b, b. (After Miiller.) 



Pig. 



11. — One of the spheroids of Sphcerozoum punctatum 

 more highly magnified, showing its spicular 

 framework. (After Miiller.) 



12. — Thalassicolla morum. (After Miiller.) 



13. — One of the spicules of Thalassicolla morum. 

 (After Miiller.) 



14. — Siliceous test of Collosphara Huxleyi. (After 

 Miiller.) 



15. — Amceba radiosa, unier four different forms, a, b, 

 c, D ; n, nucleus. (After Auerbach.) 



IG. — Amoeba princeps, under three difl"erent forms, 

 a, b, c. (After Auerbach.) 



17. — Amaba bilimbosa, under two different forms, a, b; 

 n, nucleus. (After Auerbach.) 



18. — Amoeba (?) porrecta. (After Schultze.) 



19. — Arcella vulgaris. (After Ehrenberg.) 



20. — Bifflugia globulosa. (After Ehrenberg.) 



21. — Lagynis baltica, with the animal expanded at a, 

 and retracted at b into the posterior ex- 

 tremity of the test. (After Schultze.) 



22. — Squamulina lavis ; a, its attached surface ; b, its 

 free surface, showing its oral aperture and the 

 pseudopodia extending themselves from it. 

 (After Schultze.) 



