366 



PLATE XII 



Fig. 1. Part of a pseudopodium of Actinosphcerium eichhornii Ehb., after 

 treatment with picro -sulphuric acid. The protoplasm has become partly 

 contracted in a varicose manner on the axial thread, a, so that the latter 

 is laid bare in places. 



Fig. 2. A very fine protoplasmic filament from a cell of a stamen of Trades- 

 cantia virginica. The filament becomes swollen up in its course, and the 

 swollen portion has a very beautiful alveolar structure, while the fine 

 filament does not permit any such structure to be made out. Unfortu- 

 nately I have not noted whether this drawing was made from a living or 

 a fixed object ; the latter alternative is, however, more probable. 



Fig. 3. Surface section through the bacillar border of the epithelium 

 cells of the gut of Distomum Tiepaticum. Picro- sulphuric acid, iron- 

 htematoxylin, water, a, the transverse sections of the more darkly- 

 stained conical bodies, distinctly alveolar and deposited in a mass of 

 alveoli more feebly stained and poorer in granules. Z. Apochr. 2 mm., 

 Oc. 18. Cam. luc. x 4000. 



Fig. 4. Small portion of the so-called stem filament or muscle, after fixation, 

 of Zoothamnium mucedo Entz; very distinctly made up of a fibrous 

 alveolar structure. Z. Apochr. 2 mm., Oc. 12. 



Fig. 5. Optical section through a tentacle of Podophrya elongata Clp. and 

 L. The central circle is the tentacle canal, the wall of which is formed 

 by a layer of alveoli of protoplasm. Z. Apochr. 2 mm., Oc. 18. 



Fig. 6. Compare the text, p. 179. 



