542 " THETIS " SCIENTIFIC RESULTS. 



These specimens are all in poor condition, but I think there can- 

 be no doubt of their identity with the " Challenger " species from 

 the same region. 



OPHIOCOMA BREVIPES. 



Ophiocoma brevipes, Peters, Arch. Naturg , xviii., 1, 1852, p. 85. 



Five specimens from Lord Howe Island. 



The single young specimen (disc diameter, 7 mm.) is much 

 lighter coloured than the adults (disc diameter, 25 mm.), and its 

 general appearance is correspondingly different. 



OPHIOCOMA SCOLOPENDRINA. 



Ophiura scolopendrina, Lamarck, Anim. s. Yert., ii., 1816, p. 544.. 



Ophiocoma scolopendri7ia, Agassiz,Mem.Soc.Sci.Neuchate],i.,1835, 

 p 192. 



Nine specimens from Lord Howe Island. 



Only one of these specimens is so uniformly dark as to resemble- 

 erinacetis, and even in that one the banding of the arm-spines,, 

 characteristic of scolopendrina, is indicated. 



OPHIACANTHA HETEROTrLA,^* sp. nov. 

 (Plate lii, figs. 4-6). 



Diameter of disc, 3 mm.; length of arm, 6 (?) mm. Disc 

 rather flat, circular, covered by a layer of rather coarse scales^ 

 which are, however, completely concealed by a uniform coat of 

 coarse, nearly spherical granules. Radial shields nearly con- 

 cealed, the distal ends visible, rounded, widely separated; position 

 of proximal part of each shield is indicated by a longitudinal 

 series of spinelets, usually three, rarely two or four; these spinelets 

 are very conspicuous, and seem to be the only spinelets on the 

 disc, tipper arm-plates fan-shaped, with strongly convex distal 

 margin, and sharp, proximal angle about as long as wide, separated 

 from each other from the very first. Interbrachial spaces below 

 like disc above. Oral shields much wider than long, roughly 

 pentagonal, with wide proximal angle. Adoral plates large, 

 quadrilateral, about equally wide at both ends. Oral plates much 

 smaller than adoral. Oral papillae thi'ee on each side, subequaV 

 and a much larger tooth-like one at apex of the jaw. Under 

 arm-plates pentagonal, with a proximal angle, a little wider than 



24: eVepos=other, different -Fri;X?j:^any thing rising Hke a lump, in refer- 

 ence to the two kinds of grains or spinules on disc. 



