xxxii THE VOYAGE OF H.M.S. CHALLENGER. 



Subfamily 2. Goniodiscin.e, Sladen, 1887. 



Pentagonasteridse with the abactinal area covered with flat stellate plates. Covered 

 with a uniform granulose membrane. 



Genus 1. Stellaster, Gray. 



Genus 2. Ogmaster, von Martens. 



Genus 3. Leptogonaster, Sladen. 



Genus 4. Goniodiscus, Mliller and Troschel, emend. 



Subfamily 3. Mimasterin^e, Sladen, 1887. 



Pentagonasterida? with the abactinal area covered with small stellate plates bearing 

 true paxillse. Actinal intermediate areas with imbricating plates in transverse series, 

 bearing paxilliform groups of spines. 



Genus 1. Mimaster, Sladen. 



For a Synopsis of the Subfamilies and Genera included in the Family Pentagon- 

 asteridse, see p. 262. 



Pentagonasteridse incertse sedis. 



I am unable to indicate the subfamily in which the first of the two following genera 

 should be placed, in consequence of the contradictory statements respecting the nature of 

 its abactinal skeleton. The description of the second genus, Hoplaster, is so brief and 

 insufficient, that its inclusion in this family is for the present purely tentative. If 

 Hoplaster should prove to be correctly referred to the Pentagonasteridae, it would seem 

 probable that it may be ranked in the subfamily Pentagon asterinse. 



Genus Anthenoides, Perrier. 

 Genus Hoplaster, Perrier. 



Family V. Antheneid.e, Perrier, 1884. 



Phanerozonate Asterids with thick and massive marginal plates, which may bear 

 granules or tubercles. Abactinal skeleton stellato-reticulate, or with rounded plates bear- 

 ing granules and tubercles, and may be covered with membrane. Actinal interradial areas 

 with pavement-like plates, which bear large valvate pedicellarise. 



Genus 1. Anthenea, Gray. 



Genus 2. Goniaster (Agassiz), emend. Perrier. 



Genus 3. Hippasteria, Gray. 



