EECENT MEMOIRS ON FRESHWATER RHIZOPODA, 73 



it a narrower clear graiiuleless envelope, whose outer contour 

 (corresponding probably to a membrane) is only rendered 

 distinct after application of acetic acid, then appearing 

 doubly contoured — in living examples, however, always 

 closely encompassed by the granules of the surrounding 

 sarcode. The nucleus never occurs central or indeed even 

 within the broader portion of the body, but constantly- 

 placed in the narrower basal part, and here not in the 

 longitudinal axis, but laterally (fig. 26). 



But in the centre of the anterior broader part of the 

 body a structure is to be perceived, as to the nature of 

 Avhich the author has not been able to gain any certainty. 

 It appears as a dark globular body of about O'OOl mm. in 

 diameter, and mostly, as regards its position, corresponds to 

 the common centre of the pseudopodia (fig. 26). Some- 

 times, indeed, the author thought he had perceived fine 

 lines therefrom to the pseudopodia, but could not make 

 himself certain of the existence of such ; neither could he 

 determine if the fine lines running longitudinally through 

 the stipes were continued into the body. 



Sometimes particles of an orange colour could be per- 

 ceived in the body - substance ; these were not like the 

 rounded, smooth, often coloured, granules of many Heliozoa, 

 but appeared as minute irregularly-shaped rough fragments 

 of various sizes, and occurred not in the darker centre, but 

 only in the outer granular region. They sometimes occur 

 in great quantity, when they impart a brownish-red colour 

 to the body ; sometimes they are very wide apart, and again 

 they are wholly absent. 



Crude food was seen only seldom, then lying in the outer 

 part amongst the colouring granules. 



The author never saw any pulsating vacuoles. 



The j)seudopodia are numerous, but occur only at the 

 outer and upper part of the body, never close to the stipes. 

 They are very fine, long, and pointed. On a thin axile 

 part there hung granules and clusters of finely granular 

 substance. Whether there be really a more solid axile 

 thread present, the author could not decide, though of that 

 impression. A fusion of pseudopodia he had seen in only 

 a few cases ; and that only due, as it would seem, to some 

 mechanical shock or during the capture of some foreign body 

 as food. The author was struck by the fact that they never 

 seemed to become wholly retracted into the body-mass ; 

 no doubt a considerable amount of contraction under certain 

 circumstances took place, always stopping at a certain point, 

 or nearly equidistant from the body, so that they would 



