RHIZOPODA. 
Prot, 6 
‘ Yalorous’ expedition in Foraminifera taken in Davis Strait also given. 
Milioline forms were almost entirely absent. 
Of Radiolaria, were taken in the Arctic and neighbouring seas (5), 
p. 438, species of Spongodiscus^ Spongotrochus, Haliomma, TetrapylCy Helio- 
discus^ Spongaster, Euchitonia, Trematodiscus, Dictgopodium, Actinomma. 
Marine distribution of Radiolaria (11), ii. p. 340. 
Van der Broeck’s paper on Foraminifera of 06te de la Oard, in 
Bull. Soc. Nimes, 1878, has not been seen by Recorder. 
Classification. 
Rhizopoda classified (12), p. 373, by Wallich as — 
I. Herpnerriata, No definite nucleus, no contractile vesicle. 
1. Foraminifera Lieherkuehnia). Shell never siliceous. 
2. Polycystina. Skeleton always siliceous. 
II. Protodermata. Definite nucleus, no contractile vesicle. 
1. Forms with solid skeleton — Plagiacanthida^ Acanthometrina, 
Thalassicollina ?. 
2. Forms with tubular skeleton — Dictyochidce, leading to Spon- 
GIIDA, &c. 
III. Proteina. Definite nucleus, contractile vesicle. 
1. Actinophryna. Pseudopodia monomorphous — Actinophrys, 
Gromia^ Lagynis^ Euglypha^ Cadium^ Protocystis^ Plagio- 
phrys P. 
2. Amoshina. Pseudopodia polymorphous — Amceha^ Difflugia^ 
Arcella^ PseudocUlamys. 
The Proteina lead up to Inf usoria. 
Mivart (8) proposes to classify the Radiolaria as follows : — 
Section I. — Discida^ including Spongodiscida, Hack., Disciday Hack., 
and Stylospongia. 
Subsection 1 — Coccodiscida. 
2 — Trematodiscida. 
3 — Discospirida. 
4 — Lithelida. 
5 — Spongida. 
Section ll.—Flagellifera. Flagellum, no nuclear vesicle ; includes 
Spongocycliay Spongoastericus, Euchitonia. 
in. — Fntosphcerida. With intracapsular spheroidal shell, not 
traversed by radii. No nuclear vesicle. 
Subsection 1 — Ommatida. Subdivisions — (i.) Haliommatida ; 
(ii.) Actinommatida. 
2 — Spongosphcerida. Subdivisions — (i.) Cladococcida; 
(ii.) Coclodendrida. 
Section IV. — Acanthometrida. 
Subsection 1 — Typica. Subdivisions — (i.) Acanthostaurida\ 
(ii.) AstroUthida \ (iii.) Litholophida \ (iv.) 
A canthochiasmida. 
2 — Dip loconida. 
3 — Cataphracta. 
