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I.CLASSIFICATION. I.HISTORY OF THE CLASSIPICATION OP THE ASTEROIDEA II.REASONS FOR CONSIDERING PREVIOUS CLASSIFICATIONS INVALID. III.A CLASSIFICATION OP THE ASTEROTDEA BASED ON FACTORS OF MORPHOLOGICAL IAMPORTANCE SYNOPSIS OF THE ORDERS AND FAMILIES OF THE SUB-CLASS EUASTEROIDEA. II.DESCRIPTION OF GENERA AND SPECIES. Order PEANEROZONIA. Family AACHASTERIDE Subfamily pararchasterine Genus Pararchaster, Sladen Pararchaster semisguamatus,n.sp. semisguamatus,var.occidentalis,nov. antarcticus,n.sp. Genus Pontaster,Sladen. Pontaster tenuispinus,Diben and Koren,sp. -tenuispinus,var.platymota,nov. planeta.n.SD. hebitus.n.sD. -limbatus,n.sp. -oxyacanthus,n.sp. -teres,n.sp. -forcipatus,n.sp. -forcipatus,var.echinata,nov. -mimicus,n.sp. -pristinus,n.sp.. -venustus,var.robusta,nov. -trulipe,n.sp. -subtuberculatus,n.sp. Subfamily PLUTONASTERINE. Genus Dataster,Sladen . Dytaster spinosus,n.sp. -exids,n.8p. -exilis,var.gracilis,nov. -exilis,var.carinata,nov. III.CHOROLOGY OF THE SPECIES.