ARCHER—ON RHIZOPODA. 281 
of the hitherto proposed schemes of classification one might lean to 
adopt. There is doubtless somewhat more resemblance in Greef’s new 
genus Astrodisculus to his previously established Amphizonella, to 
which, indeed, he himself refers ; but still even they appear abundantly 
distinct, and I quite concur, so far as | may venture to express an opi- 
nion, that the forms respectively referrible to Amphizonella and Astro- 
disculus demand being placed wide apart. I shall endeavour below 
briefly to recapitulate the characteristics as given by Greef in his recent 
paper of this latter new genus. 
Heterophrys myriopoda ( Arch.) 
Pl. VILL... figs 4 
Specific Characters.— Outer region colourless, granular, comparatively 
rigid and unchangeable, passing off at the margin into a fringe-like border 
of innumerable linear hyaline processes—inner region forming a large, 
globular, hyaline, definitely bounded sarcode mass, enclosing numerous large 
chlorophyll-granules, with a few colourless ones, and giving off not very 
numerous, comparatwely thick, slightly tapering, long, granuliferous, non- 
coalescing pseudopodia. 
I believe I have seen a central stellate arrangement of lines similar 
to that described in Acanthocystis turfacea by Grenacher and Greef, but 
its examination deserves to be repeated before entering upon a descrip- 
tion of this part of the structure. 
Measurements.—Diameter of the total Rizopod (leaving the pseu- 
dopedia out of view, that is, from extremities of marginal processes), 
about 34,5”’—of the inner sharply defined globe, 34,” to sty”. 
Localitves.—¥ ound as yet in but one or two spots in the county of 
Wicklow, near Carrig-Mountain, and in a boggy spot at lower end of 
Lough Dan (in the grounds of ‘‘ Lake Park’’), both very restrictedly ; 
hence this form must as yet be considered very rare. 
Affinities and Differences.—Distinguished at once from the preceding 
by its larger size, constantly possessing a copious quantity of chloro- 
phyll-granules, its longer, stouter pseudopodia, and the innumerable 
linear acute processes bordering the outer sarcode region. The colour- 
less outer region without spicula would at first glance distinguish this 
form from an example of Raphidiophrys viridis, which might possess 
but a single central globular sarcode body. The absence of the vertical 
spines at once readily distinguishes it from Acanthocystis turfacea. The 
curious resemblance of the remarkable marginal, slender, acute processes 
given off from the outer region to those represented by Greef in a new (?) 
Acanthocystis form* has been already drawn attention to. 
* Loe, cit., t.. KXVil., fig. 18; 
