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THE VOYAGE OF H.M.S. CHALLENGER. 



Dijtaster madreporifer, n. sp. 



nobilis, n. sp. 



xquivocus, n. sp. . 



biserialis, n. sp. . 



inermis, n. sp. 



Genus Plutonaster, Sladen 



P/uto7iaster bifrons, Wyville Thomson, sp. 



bifrons, (?) juv. . 



marginatus, n. sp. 



rigidus, n. sp. 



rigidus, var. semiarmafa, nov. 



ambiguus, n. sp. . 



notatus, n. sp. 



abbreviates, n. sp. 



Subgenus Tethyaster, nov. . 



Plutonaster {Tethyaster) subinermis, Philippi, sp. 



ptarelii, Diiben and Koren, sp, 



Genus Lonchotaster, Sladen 



Lonchotaster tartareus, n. sp. 



forcipifer, n. sp. . 



Subfamily Pseudarchasterinj: . 

 Genus Pseudarchaster, Sladen . 



Pseudarchaster discus, n. sp. 



tessellatus, n. sp. . 



intermedins, n. sp. 



Genus Aphrodit aster, Sladen . 



Apihroditaster gracilis, n. sp. 

 Subfamily Archasterin.e 



Genus Archaster (Muller and Troschel), emend. 



Archaster typicus, Muller and Troschel 

 Family Porcellanasteridje 

 Subfamily Porcellanasterinj-: . 



Genus Porcellanaster, 'Wyville Thomson 



Porcellanaster cxruleus, Wyville Thomson 



caulifer, Sladen . 



tuberosus, Sladen . 



crassus, Sladen 



gracilis, Sladen . 



eremicus, n. sp. . 



Genus Styracaster, Sladen 



Styracasfer liorridus, Sladen 



armatus, Sladen . 



Genus Hyphcdaster, Sladen 



Hyi^lialaster hyalinus, Sladen 



diadematus, Sladen 



inermis, Sladen . 



planus, Sladen 



Genus Tlioracaster, Sladen . 



Thoracaster cylindratus, Sladen 



