442 bulletin: museum of comparative zoology. 



Ophiocoma parva. 

 H. L. Clark, 1915. Mem. M. C. Z., 25, p. 292, pi. 14, fig. 8, 9. 



These specimens show little diversity and agree well with the 

 original specimens from Torres Strait. 

 Paumotu Islands: Makemo. Fakarava. 

 Twenty-eight specimens. 



Ophiocoma pica. 



Miiller and Troschel, 1842. Sy^t. Ast., p. 101. 



The specimens of this beautiful species are small, only 7-11 mm. 

 across the disk. 



Paumotu Islands: Makemo. 

 Three specimens. 



Ophiocoma scolopendrina. 



Ophiura scolopendrina Lamarck, 1816. Anim. sans vert., 2, p. 544. 

 Ophiocoma scolopendrina Miiller and Troschel, 1842. Syst. Ast., p. 101. 



There is nothing notable about the series of this common and well- 

 known species. 



Paumotu Islands: Makemo. Fakarava. Rangiroa. 

 Seventeen specimens. 



Ophiomastix bispinosa, sp. nov. 

 Plate 2, fig. 1, 2. 



Disk, 5 mm. in diameter; arms about 40-45 mm. long. Disk 

 covered with a thick skin completely concealing the scales; scattered 

 irregularly over the dorsal side of the disk are about 60 small, slender 

 spinelets scarcely half a millimeter long. No radial shields visible. 

 Upper arm-plates oval, the greatest width proximal to middle; the 

 outlines are obscured by the skin in which they seem to lie. Inter- 

 brachial areas below smooth, apparently naked save for a few small 

 spinelets near margin. Oral shields oval, about as wide as long, the 

 greatest width distal to middle. Adoral plates and oral plates small 

 and more or less concealed by skin. Oral papillae M or 4 on each side, 



