CON TEN Ts. 
I. CLASSIFICATION. 
I. History or THE CLASSIFICATION OF THE ASTEROIDEA ‘ 
TI. REASONS FOR CONSIDERING PREVIOUS CLASSIFICATIONS INVALID : 3 ‘ 
TIL. A CuassrFIcaTIoN oF THE ASTEROIDEA BASED ON Factors OF MorpHo.ocicaL IMPORTANCE 
Synopsis OF THE ORDERS AND Fares oF THE SuB-cLass EUASTEROIDEA . 
II. DESCRIPTION OF GENERA AND SPECIES. 
Order PHANEROZONIA : é : 
Family ARCHASTERIDE . 
Subfamily PaRaRcHASTERINE . 
Genus Pararchaster, Sladen . 
Pararchaster semisquamatus, 0. sp. 
semisquamatus, var. occidentalis, nov. 
antarcticus, . sp. 
spinosissimus, D. Sp. 
pedicifer, N. sp. + 
armatus, D. Sp. + 
Genus Pontaster, Sladen . . 5 
Pontaster tenuispinus, Diiben and Koren, sp. 
tenuispinus, var. platynota, nov. . 
planeta, n. sp. . 
—— hebitus, n. sp. . 
limbatus, D. sp. + 
oxyacanthus, D. sp. 
teres, 1. Sp. . 
forcipatus, D. sp. . . 
forcipatus, var. echinata, nov. 
—— mimicus, Nn. sp. 
— pristinus, n. sp. 
venustus, I. Sp. : 
venustus, var, robusta, nov. 
trullipes, 0. sp.» 
subtuberculatus, 0. sp. : 
Subfamily PLuronasteRINE . 
Genus Dytaster, Sladen . 
Dytaster spinosus, 0. sp. 
exilis, N. Sp. 
exilis, var. gracilis, NOV. . 
exilis, var. carinata, DOV. 
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