74 



dorsale Del, er ganske flad og kun i dens indre Del besat 

 med nogle faa, meget spredte Smaapigge af omtrent 

 samme Størrelse som dem paa de dorsale Randplader, 

 men sylformige eller tilspidsede i Enden. 



Ryggens hele Overflade er saa tæt og ensformigt besat 

 med Børster eller Smaapigge af ganske den samme Form 

 og Størrelse som de, der bedække de dorsale og den 

 øvre Del af de ventrale Randplader, at Formen af Ryg- 

 pladerne derved skjules (Fig. 25, a) og først kommer til- 

 syne, naar Piggene afskrabes. 



Bygpladerne vise sig da at være meget talrige og 

 følgelig mindre end Randpladerne, ikke stillede i regel- 

 mæssige Rader, og af rundagtig Form, større og mindre 

 om hverandre. Fem af dem (Fig. 25, c), beliggende midt i 

 Interradierne og stillede i en Kreds eller rosetformig om- 

 kring og i nogen Afstand fra Centrum, ere større end de 

 øvrige (ikke betydeligt mindre end de dorsale Randplader) 

 ligesom sædvanligt hos unge Individer af Goniaster granu- 

 lans (se min „Oversigt af Norges Echinodermer" pg. 47). 

 Rimeligvis er ogsaa det her beskrevne Individ et ungt Dyr. 



Porerne af EespirationstentaMerne (Fig. 25, f) sees enkelt- 

 vis spredte hist og her paa Ryggen i de trange Rum mellem 

 Rygpladerne. — Anus (d) er subcentral, ikke ganske i Cent- 

 rum, men lidt til den ene Side. — Madr ep or pladen (e), som 

 ligger noget nærmere Centrum end Skiveranden, er run- 

 dagtig, ikke fremragende, med faa og grove Furer. 



Bugpladerne (Fig. 26, 1) ere faa i Antal, de fleste af dem 

 betydeligt større endRygpladerne, og alle af polygonal (mest 

 sexkantet) Form. De danne 4 med Kroppens Rand lige- 

 løbende Rader. I den yderste Rad, hvor de ere størst, 

 idet de indadtil efterhaanden blive mindre, er der 5 Pla- 

 der, af hvilke den midterste næsten er saa stor som de 

 ventrale Randplader, medens de øvrige til begge Sider 

 efterhaanden aftage i Størrelse; i de øvrige Rader blive 

 de indadtil des mindre og færre i Antal. Deres Overflade 

 er flad og besat med samme Slags sylformig tilspidsede 

 Smaapigge (k) som' paa den indre Del af de ventrale Rand- 

 pladers Bugside, kun lidt større og hyppigt dannende 

 smaa, omtrent med Kroppens Rand ligeløbende Rader 

 paa hver Plade. 



Bugfurerne ere småle med 2 Rader Sugefødder, hvilke 

 hos vort Individ vare indtrukne. 



De saakaldte Furepapiller (n) ere conisk-tilspidsede 

 eller sylformige og omtrent af Størrelse som de Pigge, der 

 garnere Randen af de ventrale Randplader. De danne 

 en Tværrad af sædvanlig 4, sjeldent 5, og nær ved Arm- 

 spidsen 3 Pigge paa hver Adambulacralplade, altsaa om- 

 trent 4 Længderader. De aftage noget i Størrelse inden- 

 fra udad. De paa Mundvinklerne siddende Pigge (p) ere 

 endel længere og næsten dobbelt saa tykke som de egent- 

 lige Furepapiller og mere stumpt tilrundede i Enden. 



The ventral half of these plates (fig. 26, m), which forms 

 an angle with the dorsal part, is quite flat, and bears 

 only on its interior portion some few scattered spines 

 of about the same size as those on the dorsal marginal 

 plates, but awl-shaped or pointed at the extremity. 



The whole surface of the back is so thickly and 

 uniformly covered with bristles or small spines of quite 

 the same form and size as those which cover the dorsal 

 and the upper part of the ventral marginal plates, that 

 the shape of the dorsal plates is thereby concealed (fig. 

 25, a) and does not appear until the spines are scraped off. 



The dorsal plates shew themselves then to be more 

 numerous and consequently smaller than the marginal 

 plates, not placed in regular rows, and of roundish shape, 

 larger and smaller together. Five of them (fig. 25, c), 

 lying in the midst of the interradial spaces and placed 

 in a circle or in the shape of a rosette around and at 

 some distance from the centre, are larger than the others 

 (not much smaller than the dorsal marginal plates) as 

 usual in young specimens of Goniaster granulans (see my 

 „Oversigt af Norges Echinodermer" p. 47). Probably 

 also the specimen here described is a young animal, 



The pores of the respiratory tentacles (fig. 25, f) are 

 seen distributed isolatedly here and there on the back 

 in the narrow spaces between the dorsal plates. The 

 Anus (d) is subcentral, not quite in the centre, but a 

 little on one side. The madreporic body (e), which lies 

 somewhat nearer to the centre than to the margin of 

 the disc, is roundish, not prominent, and with a few 

 coarse furrows. 



The ventral plates (fig. 26, 1) are few in number, most 

 of them considerably larger than the dorsal plates, and 

 all of polygonal (mostly six-sided) shape. They form 4 

 rows running parallel to the margin of the body. In the 

 outer row where they are largest — as they become gradu- 

 ally smaller towards the interior — there are 5 plates of 

 which the central one is nearly as large as the ventral 

 marginal plates, while the others on both sides gradually 

 decrease in size; in the other rows they become smaller 

 and fewer in number towards the interior. Their surface 

 is flat and covered with awl-pointed small spines (Jc) of the 

 same sort as those on the interior part of the ventral 

 side of the ventral marginal plates, only a little larger, 

 and frequently forming small rows which run nearly paral- 

 lel to the margin of the body on each plate. 



The ambulacral furrows are narrow with 2 rows of 

 water-feet which in our specimen were drawn in. 



The ambulacral papillce (n) are conically pointed or 

 awl-shaped, and about of the same size as the spines 

 which garnish the margin of the ventral marginal plates. 

 They form a transverse row of usually 4, seldom 5, and 

 near to the point of the arm 3 spines on each adambu- 

 lacral plate, that is about 4 longitudinal rows. They 

 decrease somewhat in size from within outwards. The 

 spines on the bucal angles (p) are rather longer than 

 the ambulacral papillæ, nearly twice as thick, and more 

 obtusely rounded at the extremity. 



