PLATE LII. 
Figs. 1, 2. PENTAGONASTER ARCUATUS, Nn. sp. 5 a . 
. Abactinal aspect ; magnified 14 diameters. 
. Actinal aspect ; magnified 14 diameters. 
[For magnified details of this species see Pl. XVIII. figs. 5, 6.] 
Figs. 3, 4. NYMPHASTER BIPUNCTUS, 0. sp. : . 
. Abactinal aspect; magnified 2 diameters. 
. Actinal aspect ; magnified 2 diameters. 
[For magnified details of this species see Pl. LIII. figs. 11, 12.] 
Figs. 5-8. GYMNASTERIA CARINIFERA (Lamarck), von Martens, 
. Abactinal aspect of a young example; magnified 2 diameters. 
. Actinal aspect of a young example; magnified 2 diameters. 
. Adambulacral plates and adjacent portion of the actinal surface of the 
same example ; magnified 10 diameters, 
. A portion of the abactinal surface of the same; magnified 10 diameters. 
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