ACTINOSPH^RIUM OR ACTINOPHRYS. 7 



understand how the shells of the last two genera are made, 

 and of what service they are? 



Drawings of these forms are desirable. 



Calkins: Genera and Species of Amoeba. Trans. Fifteenth International 



Congress on Hygiene, 1912. The Fertihzation of A. proteus. Biol 



BuL, 13, 1907. 

 Dellinger: Locomotion of Amoeba and Allied Forms. Jour. Ex Zool 3 



1906. ■' ' 



Metcalf : Amoeba Studies. Jour. Ex. Zool., 9, 1910. 

 Popoff: Ueber den Entwicklungs cyclus von A. minuta. Arch. f. Protis- 



tenk., 22, 1911. 

 Schaefifer: Notes on the Specific and Other Characters of Amoeba Proteus, 



etc. Arch. f. Protistenk., 37, 1916. 

 : Taxonomy of the Amebas. Carnegie Inst., Washington, 1926. 



THE FORAMINIFERA. 



With very few exceptions Foraminifera are marine and pro- 

 vided with shells. Specimens may be obtained from material 

 scraped from wharf-pilings. Examine them with a low power 

 by reflected light. 



1. Carefully examine various shells, compare them with each 

 other and with figures. Notice the great variety in size and 

 shape and determine how the chambers must have been added 

 during growth. 



2. Observe a single opening in a shell, and determine whether 

 the general surface has any finer perforations. Be sure to under- 

 stand the relation of the live animal to the shell. 



Make drawings of several types of shells. 



Farmer: Foraminifera, pp. 133-139, Lankester's Treatise. 

 Flint: Recent Foraminifera. Rep. U. S. Nat. Mus., 1897. 

 Calkins: Marine Protozoa of Woods Hole. Bull. U. S. F. C, 1901. 



ACTINOSPH^RIUM OR ACTINOPHRYS. 



Find, as usual, with the low power, and increase the magni- 

 fication as occasion demands. 



1 . Note the many fine radiating pseudopodia. These are quite 

 stiff compared with those of Amoeba and for a considerable time 

 show little change, not being pushed out and retracted constantly 

 as in Amoeba. Is the animal flat or spherical? 



2. Both ectoplasm and endoplasm are so filled with vacuoles 



