FORAMINIFERA 



95 



protoplasm which is set free has a very viscid consistency. 

 It becomes drawn out between the broken pieces of shell 

 into threads, which frequently stick to the glass or the 

 needles ; generally the protoplasm shows a very glutinous 

 consistency. In Discorbince the protoplasm set free in this 

 manner underwent in all cases immediately or very soon an 

 essential alteration, since it neither showed movements nor 

 had the threads that were stretched across any inclination 

 to contract themselves together into spherical forms. The 

 Miliolidce behave differently in this respect. Here the viscid 

 protoplasm becomes in like manner drawn out into thinner 

 or thicker threads, in which phenomena of streaming and 

 undulating movements are to be observed for a Jong time. 

 The protoplasm also of Miliolidce partially broken up can 

 still send out pseudopodia for a long time. All this serves 

 to prove that the protoplasm of these Ehizopods is much 

 more tenacious of life than that of Discorbina and many 

 others. 



When Miliolidce are broken up, larger or smaller 

 portions of protoplasm are not infrequently separated off', 

 which immediately assume a globular shape and form larger 

 or smaller drops. These drops continue to show slight 

 amoeboid movements for some time ; at their periphery 

 wave-like up-and-down movements are exhibited, and thus 

 there is a continual, though but slight, change of shape 

 going on. 



Such drops of protoplasm show with great distinct- 

 ness a clear alveolar margin, which is limited externally by 

 a somewhat strong dark border as by a pellicle. The thick- 

 ness of this alveolar layer I have estimated by various 

 measurements at about O'OOOG mm. On compressing the 

 drops more strongly the radial striation of the marginal 

 alveolar layer can be plainly recognised (Plate II. Fig. 5, 1). 

 The internal protoplasm following on this layer is very 

 opaque on account of the numerous colourless granules and 

 brown fat drops which it encloses ; yet it can be recognised 

 that it has usually a radially striated structure down to 

 some depth (see Plate II. Fig. 5, a). The resemblance of such 

 drops of protoplasm to the drops of oil-foam earlier described, 



