MORPHOLOGY AND TAXONOMY OF THE SARCODINA 461 



6. Test close-fitting about organism. . .Genus Lithocolla Schultze 

 Test separated from plasm by fluid zone 



Genus Eleorhanis Greeff 



7. Test made up of colorless spherules . . Genus Pompholyzophrys Archer 

 Test made up of silicious discs or scales 



with or without spines 8 



8. Test of tangential scales and radial spines 



Genus Acanthocystis Carter 

 Test of tangential, perforated discs; no 

 spines Genus Pinaciophora Greeff 



Order IV. DESMOTHORACA. 



1. Capsule spherical, with or without stalk. . 2 

 Capsule polyhedral, openings small, stalked 



Genus Hedriocystis 



Hertwig and Less. 



2. Capsule with stalk, openings large. .Genus Clathrulina Cienkowsky 

 Capsules without stalks, openings small. . . 3 



3. Openings with collars Genus Choanocystis Penard 



Openings without collars Genus Elaster Grimm 



Sub-class II. RADIOLARIA Joh. Muller. 



The great number of genera of Radiolaria make it impossible to give 

 more than a superficial survey of this group. For keys to 4 legions, 21 

 orders and 36+ families and many hundred genera and species, see mono- 

 graphs by Hertwig, 1879; Haeckel, 1887, and Schewiakoff , 1926. (See p. 442). 



Class II. RHIZOPODA von Sieb. 



1. Naked; Heliozoa-like; radiating pseudo- 



podia Sub-class 1. PRCtfEOMYXA 



Naked or shelled; pseudopodia not Helio- 

 zoa-like 2 



2. With myxopodia and Plasmodium forma- 



tion Sub-class 2. Mycetozoa 



No plasmodium formation 3 



3. With calcareous shells ; marine . Sub-class 3. Foraminifera 

 Naked or with chitinous tests. .Sub-class 4. Amoebaea 



Sub-class I. PROTEOMYXA. 



1. Individuals Heliozoa-like; usually solitary. 2 

 Individuals fuse into thread-like plasmodia 



Family 1. Labyrinthulidae 



2. With flagellated swarmers Family 2. Zoosporidae 



Without flagellated swarmers. . .Family 3. Vampyrellidae 



Family 1. Labyrinthulidae Haeck. 



Parasitic in algae Genus Labyrinthula Cienkowsky 



Free-living in fresh water and earth . . . Genus Monobia Schneider 



Family 2. Zoosporidae Zopf-Delage. 



Intracellular parasites of Algae, Volvox, etc. 



Genus Pseudospora Cienkowsky 



Starch-eating ameboid forms Genus Protomonas Cienkowsky 



Free-living; body red; marine Genus Protomyxa Haeckel 



