XXxll THE VOYAGE OF H.M.S. CHALLENGER. 
Subfamily 2. Gonropiscinm, Sladen, 1887. 
Pentagonasteridze 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, Miller and Troschel, emend. 
Subfamily 3. Mimastertn#, Sladen, 1887. 
Pentagonasteridze with the abactinal area covered with small stellate plates bearing 
true paxille. 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- 
asteridze, see p. 262. 
PENTAGONASTERIDE tncerte 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 Pentagonasteridx, it would seem 
probable that it may be ranked in the subfamily Pentagonasterine. 
Genus Anthenoides, Perrier. 
Genus Hoplaster, Perrier. 
Family V. ANTHENEIDS, 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 pedicellariz. 
Genus 1. Anthenca, Gray. 
Genus 2. Goniaster (Agassiz), emend. Perrier. 
Genus 3. Hippasteria, Gray. 
