CONTENTS. 



I. CLASSIFICATION. 



PAGE 



I. History of the Classification of the Asteroidea ..... xvii 



II. Keasons for considering previous Classifications Invalid .... xxii 



III. A Classification of the Asteroidea based on Factors of Morphological Importance xxiii 



Synopsis of the Orders and Families of the Sub-class Euasteroidea . . . xl 



II. DESCRIPTION OF GENERA AND SPECIES. 



Order PHANEROZONIA . 



Family Archasterid.s . 

 Subfamily Pararchasterin/E 

 Genus Pararcliaster, Sladen . 



Pararchaster semisquamatus, n. sp. 



semisquamatus, var. occidentalis, nov. 



antarcticus, n. sp. 



spinosissimus, n. sp. 



pedicifer, n. sp. . 



armatus, n. sp. 



Genus Pontaster, Sladen 



Pontaster tenuispinus, Diiben and Koren 



tenuispinus, var. plati/nofa, nov. 



planeta, n. sp. 



hebitus, n. sp. 



limbatus, n. sp. 



oxyacanthus, n. sp. 



teres, n. sp. 



forcipatus, n. sp. . 



forcipatus, var. eclrinata, nov, 



mimicus, n. sp. 



pristinus, n. sp. 



venustus, n. sp. 



venustus, var. robusia, nov 



trullipes, n. sp. 



subtubercidatus, n. sp. 



Subfamily Plutonasterin^e 

 Genus Dytaster, Sladen 



Dytaster spinosus, n. sp. 



exilis, n. sp. 



exilis, var. gracilis, nov. 



exilis, var. carinata, nov 



sp. 



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