RHIZOPODA. 
543 
sarcode ; the axes of the pseiidopodia radiate from a small globule 
occupying the centre of the solitary s.arcodal ball, which contains one 
nucleus and ten to twenty peripheral pulsatile vacuoles. Evidently gono- 
rically distinct from this, is R. elegans^ Hertwig & Lesser (3), pp. 218-220, 
pi. iv. fig. 1, often aggregate, the individuals connected by sarcodal 
bridges and surrounded by small curved spicules ; one nucleus ; chloro- 
phyll-balls present ; pseudopodia long, not branched, Containing granules. 
In habit, very like Spheerastrum conglohatum [Zool. Rec. x. p. 530], Greeff 
(1), pp. 29 & 30, pi. ii. figs. 24-26 ; colonies of ten to twelve globular acti • 
nophryoid Rhizopods, connected by sarcodal strings and a sinuous fringe 
of thin protoplasm ; nucleus central. 
Acanthocystis viridis (Ehrbg.) (turfacea, Cart.) ; Greeff (1), pp. 3-14, 
pi. i. figs. 1-4. From the small central ca^dty of the so-termed “central 
capsule,” delicate filaments radiate through the sarcode-ball into the 
pseudopodia; radiating siliceous spicules of two kinds, large, slightly- 
forked and smaller, strongly bifurcate, but with basal expansions 
resting on the surface of the body ; also curved tangential spicules ; 
during encystation, a siliceous trellis-ball is formed below the spicular 
skeleton. A.Jlava, sp. n., Greeff (1), pp. 17 & 18, pi. i. fig. 1 ; spinifera, 
id. 1. c., pp. 14-17. A. viridis and turfacea are also described by 
Hertwig & Lesser (3), pp. 193-201 & 204-209, pi. iv. fig. 3 ; A. aculeata, 
sp. n., iid. 1. c. pp. 201-203, pi. iv. fig. 2. “ Skeleton chiefly formed of 
spines with basal dilatations, sarcodal body differentiated into the homo- 
geneous endosarc (one nucleus), and granular ectosarc (several contractile 
vacuoles), pseudopodia long, thin, not branched, graiiuligerous.” 
Hyalolampe (g, n.) fenestrata^ Greeff (1), pp. 18-20, pi. i. figs. 6 & 7 
{Pompholygophrys punicea^ Arch.), Hertwig & Lesser (3),pp. 220-222; JT. 
exigua, iid. 1. c. pp. 222-224, pi. iv. fig. 6 (= Astrodisculus, several species 
described by Greeff). Skeleton formed of several layers of isolable siliceous 
globules ; during encystation, a second, inner, poriferous, siliceous capsule 
is developed ; protoplasm granulose ; one nucleus ; vacuoles not con- 
tractile ; pseudopodia not granuligerous, rarely dichotomous. 
On a problematic Rhizopod, allied to Astrodisculus, cf. Archer, Q. J. 
Micr. Sci. xiv. pp. 317 & 318. 
Elceorhanis cincta [Zool. Rec. x. p. 530], Greeff (1), pp. 23-26, pi. i. 
fig. 10. A hyaline ball enclosing an oil like globule, and surrounded by 
a thin layer of sarcode, partly concealed by sand-grains, diatoms, &c. ; 
pseudopodia radial. Connected with Diplophrys ? 
Pinaciophora Jluviatilis [Zool. Rec. x. p. 530], id. 1. c. pp. 26 & 27, pi. i. 
figs. 15-17. Surrounded (at some distance) by a shell composed of small 
siliceous, perforated plates, which are traversed by the pseudopodia ; a 
central capsule (endosarc ?) is present (Rhine). Has much in common 
with the following genus . 
Pinacovystis riihicnnda, g. & sp. nn., Hertwig & Lessor (3), pp. 209- 
211, pi. iv. fig. 6. Skeleton formed of small roundish, neither imbri- 
cated nor perforated plates, without spines, &c. ; sarcodal body differen- 
tiated into endosarc (with single nucleus) and ectosarc (with granules 
of different size) ; contractile vacuoles none (Marine). 
Hedriocystis pellucida, g. & sp. nn,, iid. 1. c. pp, 225-227, pi. v. fig. 5. 
