ARCHER—ON RHIZOPODA. 279 
Genus, Heterophrys (Arch.). 
Generie Characters.—Rhizopod composed of two distinct sarcode re- 
guons—the inner one or several dense, globular sarcode masses often bearing 
colouring granules—the outer forming a complete investment thereto, more 
or less coloured, not enclosing any spicula or differentiated structures, but 
gwing off at the circumference marginal processes, and allowing the passage 
Forth from the inner sarcode mass of numerous linear, elongate, granuli- 
Jerous, non-coalescing pseudopodia. 
The Rhizopoda falling under this genus appear individually com- 
parable to a Raphidiophrys or an Acanthocystis, the outer region des- 
titute of spicula—to a Pompholyxophrys, the outer region destitute of the 
peculiar globular structures characteristic of that new genus—to an As- 
trodisculus, the outer region not condensed, but of a mobile sarcode, and 
the inner without the ‘‘ central capsule ;”’ so far differing thus from all 
these in a negative manner, and, further, differing from them in a posi- 
tive manner, by the margin of the outer region giving off the charac- 
teristic processes. In the fringe-like border formed by the numerous 
fine linear processes of Heterophrys myriopoda, however, there is much 
resemblance to the same portion of Greef’s form of Acanthocystis, un- 
named, which, as I have mentioned, appears to me well distinguished 
as a specific form, figured in his Pl. XXVII., fig. 18. This genus dif- 
fers from Actinophrys sol in the amount of differentiation in the body- 
structure expressed in the two sharply-marked strata of sarcode of which 
it is composed. 
Heterophrys Fockw (Arch.). 
fl XS. fig.3. 
Specific Characters.— Outer region of a palish buff colour or nearly 
colourless, mobile, not homogeneous, but showing various lines, dots, gra- 
nules, and inequalities, frequently changing in aspect, and its margin 
fading off indefinitely, or gwing off indefinite, variously figured marginal 
processes—inner region one or several orbicular sarcode masses of a light 
bluish-coloured tint, enclosing various opaque granules, colourless and of a 
brownish colour, and sometimes chlorophyll-granules, its margin sometimes 
exhibiting one or more pulsating vacuoles, and giving off numerous linear, 
colourless, granuliferous, non-coalescing pseudopodia ; the compound groups 
sometimes cohere for a length of time, finally conjoined only by the persis- 
tent mutual fusion of the pseudopodia extending from one to another. 
Measurements.—Somewhat variable in size, diameter of inner globe 
averaging about 3559”. 
Localities. —Found in various situations in the counties of Wicklow. 
Cork, Kerry, Westmeath, in moor pools, not unfrequently, but scanty, 
Affinities and Differences.—Distinguished at first glance from the 
form I associate with it under the name of Heterophrys myriopoda by 
its much smaller size, less green colour of the inner body, more highly 
