72 PROF. F. J. BELL ON THE [Feb. 19, 



continua tuberculorum similium 7-9, versus apices brachiorum 

 descrescentium, cari?ias brachiorum coronat ; minora 1-3 in late- 

 ribus brachiorum series duplices utrinque formant ; ad angulos 

 stelbv vulgo nulla ; tesselce ventrales proprice sat magnce, se- 

 junctce, granula majuscula, tuberculis haud intermixta, gerunt ; 

 pedicellariee lineares elongates in vicinis ambulacrorum, rariores 

 in dorsualibus tuberculis destitutis, conspiciuntur ; papillce am- 

 bulacrales internee 7, externa 2 (rarius 1 v. 3), complanatce ; 

 orales series duplices formant, infernas 12, externas 5 nume- 

 rates. Hab. ad oras insula; indicae Billiton (specimen junior ?)." 



Oreaster lincki. 



Asterias lincki, De Bl. Diet. Sci. Nat. Ix. p. 219. 



Pentaceros muricatus, Perrier, Rev. Stel. p. 239 \ 



R=3 r. Disk moderately high ; arm moderately wide, not at all 

 acutely pointed. Lophial spines well developed, the apical very 

 prominent ; a spine or two sometimes developed within the apical 

 region. 



About 18 marginal plates; the superomarginals alone form the 

 sides of the arms, and are alone provided with spines ; these are con- 

 fined to the distal end, and vary considerably ; from one to four may 

 he developed, and in some specimens they are twice as long as they 

 are in others. 



Adambulacral spinulation diplacanthid ; in the inner row eight 

 poorly developed spines, in the outer two, which are much stouter, 

 for each plate ; the tips of the latter are often marked by several 

 shallow grooves ; as so frequently happens, a forcipiform pedicellaria 

 is developed between each inner group of adambulacral spines. 



The separate ventral ossicles are hardly, if at all, to be made out 

 under the exceedingly coarse granulation by which they are covered ; 

 the separate granules vary considerably in size, and a few valvular 

 pedicellariae are scattered among them. The granules on the mar- 

 ginal plates are hardly less coarse. The dorsal surface is rendered 

 markedly reticulate by the great size and close approximation of the 

 poriferous areas, two of which pass along each side of every arm ; 

 in the middle of the arm the second of these may equal in length as 

 much as half the whole height of the arm ; sometimes the connecting 

 processes of the ossicles become very delicate, when the whole side 

 of the arm appears to form a huge poriferous area. Spines are very 

 irregularly developed at the angle of the areas ; sometimes they are 

 distributed so regularly that one may almost speak of a regular row 

 of spines running on either side of the lophial series ; in other cases 

 they are completely absent. This happens sometimes also to the 

 spines of the lophial ridge itself, but they are ordinarily very well 

 developed, as are, too, the apical spines and the spines that stand 

 below them on the sloping sides of the disk. The granulation on the 

 dorsal spines and ossicles is very coarse and extends sometimes quite 



1 M. Perrier here adopts the name of Linck ; a course in which, I regret, 

 I cannot follow liim. 



