RECENT MEMOIRS ON FRESHWATER RHIZOPODA, 359 



yellow appearance, which, especially at the outer circum- 

 ference, appears as a yellow border. The sarcode likewise 

 carries many dark, shining granules, surrounding the sur- 

 face, and in vigorous movement. From the outer circum- 

 ference of the body there project in a radiant direction 

 delicate filamentary pseudopodia, scarcely so long as the 

 diameter of the body, in which the refractive and compara- 

 tively large granules emanating from the surface, and from 

 the interior run up and down with surprisingly great rapidity. 

 A nucleus,' or central capsule-like structure (says the author) 

 1 could not perceive." 



The fact that the author's figure shows the pseudopodia 

 as passing down, and continued directly through the yellow 

 border can, I fancy, be interpreted in two ways : either 

 that the yellow border represents an outer inviting envelope 

 (compare the figure in this regard with Astrodisculus, Greeff, 

 PI. XXI, fig. 3, or the author's own Astrococcus, fig. 2, or 

 with H. tariahilis, PI. XXII, fig. 15) — or the continuation 

 inwards of the pseudopodia (fig. 20) may represent a pro- 

 longed axile thread comparable to that of Actino-sphserium, 

 or better that oi Hapliidiophrys pallida. 



I suppose that the latter would be rather the author's 

 opinion, so far as we can judge from his brief account of it. 

 Were this the true explanation the form would seem to fall 

 close along with Actinophrys, for it is most probable that 

 only the opaque contents prevented the author from per- 

 ceiving a nucleus. The author does not enter into any more 

 precise description as to the nature of the green ''capsules" 

 (query, chlorophyll- granules ? but the tint of the figure 

 is not that of chlorophyll), nor of the bacillar bodies 

 (" Stabchen "). The author found this pretty form in spring, 

 in sandy river mud, filled with diatoms. It is to be hoped 

 he may refind it in the same locality, and be able to submit 

 it to fresh examination and experiment. 



Heliozoa SJceletophora. 



In this group a greater number and variety of forms present 

 themselves than in the Askeleta or in those which I here 

 suggestively denominated Chlamydophora, the distinguishing 

 generic and specific features here being in the main due to 

 the differences in the formation of the "skeleton," whilst 

 the specialities of the soft parts (the body-mass and the 

 pseudopodia), as well as, to some extent, the colour, offer 

 holdpcints (though no doubt not so readily grasped) to 

 assist in their systematic arrangement. 



Except that the endosarc it is which contains the nucleus 



