RHIZOPODA. 
Prot, 7 
Classification. 
R. Hertwig, (7), classifies the Rhizopoda thus : — 
I. Moneres. 1. Gymnomoneres. 2. Lepomoneres, 
II. Amcebina. 1. Gymnamoehce. 2. Lepamcehoe. 
III. Thalamophora (Rhizopods with one or more nuclei and a chiti- 
nous monaxial shell, generally calcareous and always provided 
with 1-2 openings for the passage of pseudopodia). 
1. Monothala/nia (shell 1-chambered, not calcareous), (a) Amphi- 
stomata^ (b) Monostomata. 
2. Polythalamia (shell calcareous, &c.). (a) Imperforata, (b) Per- 
forata seu Foraminifcra. 
IV. Heliozoa. 1. Aphrothoraca seu Actinophryidoi. 
2. Chalarothoraca seu Acanthocystidce. 
3. Desmothoraca seu Clathrulinidce. 
V. Radiolaria. 1. Thalassicollece. 2. Sphcerozoece. 3. Tripylece. 
4. Peripylece. 6. Monopylem. G. Acantkometrece. 
He adds two so-called supplementary tables, viz. : — 
III. Thalamophora. 
1. Imperforata. (a) Amphistomata, (b) Monostomata. 
2. Perforata seu Foraminifera. 
IV. Radiolaria. 
1. Heliozoa. Radiolaria without central capsule. 
2. Cytophora. Radiolaria with central capsule. 
Rhizopoda divided by Leidy, (8) p. 7, into the orders, 1. Protoplasta ; 
2. Heliozoa ; 3. Radiolaria ; 4. Foraminifera ; 5. Monera. The order 
Protoplasta is divided into the suborders (i.) Lohosa (Amceha, &g.) and 
(ii.) Filosa {Pamphagus^ &c.) 
Genera, Species, &c., referred to. 
Radiolaria. 
Acanthometridcn^ (7) p. 134. None of the spines lie in the median 
plane, but all form angles of 45® with it. Certain forms stated by Hackel 
to be siliceous, prove to be entirely soluble in hydrochloric acid. The 
so-called cells of the capsule of Joh. Muller & Hackel, are nuclei. The 
yellow pigment bodies are cells. A protoplasmic network occupies the 
innermost sarcode of the extracapsular portion in all species. The gela- 
tinous cilia are not of the nature of pseudopodia. Development, p. 147 ; 
the changes of the nucleus are interesting. 
AcanthophractidcB, (7) p. 153. Nearly allied to Acanthometridce, the 
skeleton is in all cases soluble in hydrochloric acid. 
Sphcerozoidce, (7) p. 157. Contains all the colonial Radiolaria. Repro- 
duce by swarm-spores ; central capsule has one or a few small nuclei. In 
Collozoum, macro- and micro- spores are distinguishable. 
CollidcB, (7) p. 160. 
Spha’ridea, (7) p. 167. Includes the Ethmosplmrida^Ommatidce, 
