THE STELLEROIDEA 253 



The arms are short and the shape of the starfish is generally penta- 

 gonal. SUB -FAMILY 1. PENTAGON ASTERINAE. Pentagonasteridae with 

 rounded, polygonal, or paxilliform abactinal plates. Genera Anthenoides, 

 Per. ; Asterodon, Per. ; Astrogonium, Miiller & Troschel ; Calliaster, Gray ; 

 Calliderma, Gray ; Chitonaster, Slad. ; Comptonia, Gray ; Dorigona, Gray 

 (Xymphaster, Slad.) ; Goniodon, Per. ; Hoplaster, Per. ; Iconaster, Slad. ; 

 Leptaster, Lor. ; Mediaster, Stimps. ; Metopaster, Slad. ; Mitelephaster, Alcock ; 

 Mitraster, Slad. ; Nectria, Gray ; Odontaster, Verr. (Gnathaster, Slad.) ; 

 Paragonaster, Slad. ; Pentagonaster, Schulze ; Phaneraster, Per. ; Pycnaster, 

 Slad. ; Rosaster, Per. ; Stephanaster, Ayres. SUB-FAMILY 2. GONIODISCINAE. 

 Pentagonasteridae with flat, stellate, abactinal plates. Genera Goniodisc^ls, 



FIG. IX. 

 Abactinal view of Hippasterias phrygiaiia. 



Miill. & Trosch. ; Leptogonaster, Slad. (included by Perrier in Archasteridae) ; 

 Stellaster, Gray ; Ogmaster, v. Martens. SUB-FAMILY 3. MIMASTERINAE. 

 Pentagonasteridae with small, stellate, paxilliferous abactinal plates. 

 The plates of the actinal intermediate areas imbricate over one another. 

 Genus Mimaster, Slad. Hoplaster, Per., is included by Sladen in the 

 Pentagonasteridae, but Perrier places it with Goniodon, Gnathaster, and 

 Asterodon, in a special sub-family of Archasteridae. 



FAMILY 9. ANTHENEIDAE, Per. Phanerozonia with opposite ambu- 

 lacral ossicles and massive marginal plates. Abactinal skeleton stellato- 

 reticulate ; the actinal intermediate plates bear large valvate pedicellariae. 

 Genera Anthenea, Gray ; Goniaster, Ag. (em. Per.) ; Hippasterias, Gray 

 (Fig. IX.). 



FAMILY 10. PENTACEROTIDAE. Phanerozonia with opposite ambu- 



