28 n. M. WOODCOCK. 



probably undergoes slight alterations in shape as tlie asso- 

 ciates increase in age and size, but I feel certain that in life 

 it remains contiguous to the body throughout, at any rate, 

 the trophic period. Foi', although the bilobed appearance may 

 become very slight (cf. fig. 21), yet in section the V-shaped 

 inturuing of the limiting-membrane and ectoplasm is always 

 noticeable to a greater or less extent, and there is always this 

 thickening of the investing membrane. 



The limiting membrane cannot be traced through the 

 septum as a distinct layer, having apparently fused with the 

 ectoplasm to form a single homogeneous partition ; it certainly, 

 however, has entered the septal plane (compare my figures 

 with Kunstler's fig. 8) . Where it bends inwards, and also for a 

 short distance after the junction, the ectoplasm of each asso- 

 ciate is frequently somewhat thick and loose in character ; 

 more internally^ however, throughout the greater part of the 

 septum, it is narrow and dense. 



{h) General cytology. 



The cytoplasm. — The general nature of the cytoplasm in 

 Cystobia is well seen in figs. 12, 18, and 19, PI. 2, the first 

 example being viewed whole, but more or less in optical 

 section, and the others being actual sections. It consists of 

 innumerable numbers oE paraglycogen spherules of various 

 sizes imbedded in a semi-fluid matrix, often with minute, 

 highly-refringent granules of a different nature in between. 

 In sections, which were always drawn as they appeared under a 

 Zeiss apochromatic lens, the appearance varies rather, due 

 chiefly to the method of fixing and staining employed. After 

 staining with iron-hgematoxylin and orange, one usually gets a 

 reticular appearance, the meshes being of varying size. This 

 is shown, for instance, in figs. 37 a and 52, and is due to the 

 fact that the stain has been extracted from the paraglycogen 

 spherules much more readily than from the ground-substance. 

 Hence the apparent spaces of the reticulum arc really occu- 

 pied by the unstained grains. In fig. 37 J> the reticulum is 



