482 s. GOTO 



" Measurements : — 



R = 53; r = 21.5; breadth of arm at base 18. 

 R=70; r = 30; breadth of arm at base 29. 



" Hah. West Australia (Dick ILxrtog's Island)." 



Fmilier on in the same paper Orenster nodosiis is described ['84, p. 70] : 



" Oreaster nodmus. 



[References to Perrieu, '70, p. 240 and Linné, 8jst. nat. ed. xii. p. 

 1100 pars.] 



" Prof. Perrier prefers Linck's name to that of LinN/EUS, whom, in- 

 deed, lie abstains from directly quoting, his only reference being to Gmeltn's 

 edition of the Systema Naturse. 



" R = 2.5 r to 3 r. Disk considerably elongated ; arms long, rather narrow. 

 Lophial line well marked, with prominent rounded projections; the apical 

 spines very prominent, and a central one typically developed. 



" About 30 superomarginal, and one or two more inferomarginal plates ; 

 lx)th sets obscure, and without any spines, the lower altogether confined to 

 the actinal side. 



" Adambulacral spinulation diplacanthid ; ordinarily ssven spines in the 

 inner row, of Avhich two or thi'ee in the middle are distinctly longer than 

 those at their sides. In the outer row three spines, about twice as stout as 

 those of the inner row ; between the two rows there stands a well-developed 

 forcipifonn pedicellaria. 



" The separate ventral ossicles are a good deal obscured by the coarsa 

 granulation Avith which they are covered ; the only region in which there can 

 be said to be a distinctly serial disposition of the plates is that which extends 

 along the side of the ambulacral groove. Many of the investing granules are 

 more than a millimeti-e in length along their longest axis, and the sessile 

 valvular pedicellarife are veiy numerously represented. A similar coarse 

 granulation is found on the marginal plates ; l^ut any resemblance to 0. Uneki 

 is opposed by the develoi^ment of a very large number of pedicellariae.^- 



" The upx>er surface might ahnost be said to be one mass of pedicel- 



1) "Have we not here another example of the kind of balance between the development of 

 spines and of pedicellarine ? Cf. the case of Asterias fjlacialis, Zool. Anz. 1882, p. 283." 



