JAPANESE ASTEEOIDEA. 



497 



AiTuenes miciterste Tavlersekke liave 

 de stöi-ste i stön-else og Form lignende 

 dem, som beklsede de store Eygx^igge, 

 Paa hver Aim. findes der demsest — 

 foniden de ovenfor beskrevue Pigge, 

 som danne ' Borgen ' og ikke kimue 

 henregues til Armene — 3 staerke ke- 

 gledanuede Pigge (midtagelsesvis 2 

 eller 4), de to paa Armens indre 

 Deel, den tredie taet ved dens Spidse, 

 alle livilende paa den midterste Ta- 

 vlersekke ; samt paa liver Side 2 (imd- 

 tagelsesvis 1 eller 3), udgaaende 1 en 

 nogen skraa Eetning fra to (1-3) af 

 de övre Kandplader, som ligge heni- 

 mod Armens Spidse. Kandplademes 

 Antal c. ^f ; de nedre frembyde intet 

 mserkeligt ; Pedicellarier savnes paa 

 dem begge, Derimod findes en enkelt 

 stör Klappetang liist og her paa 

 Bugtavleme, livis Beklsedning foiTes- 

 ten bestaaer af Kom af meget for- 

 skjellig Stön-else, 2-6 store tavlefor- 

 mige Gryn, omgivne af mange smaae, 

 men kantede og flade ligesom de 

 större ; som hos andre Oreastre fort- 

 ssetter et smalt Bselte af disse Bug- 

 tavler sig mellem Ai-mf m-erne og Band- 

 plademe lige til Ai-mspidsenie. De 

 indre Fodpapiller ere meget fine, 6-7 

 i hver Gnii^pe, men af den hos 

 Slsegten ssedvanHge Foiin ; de ydre 

 ere brede, flade og butte, to for hver 

 Grappe af hine. En langgi'enet Tang 

 er anbragt mellem hvert Sœt. 



" Det nsestmindste Expk. (B) (R= 

 70 mm, r = 26) afviger vsesenhg kim 

 fi-a det mindre ved en mere sam- 

 mensat Bygning af ' Borgen,' som bedre 



these pore-areas are covered partly 

 with small pedicellarise, partly with 

 finer gi-aniües than those wliich cover 

 the dermal skeleton, of wliich the 

 marginal plates, the ventral x^lates 

 and the median row of plates of the 

 arms have tlie largest, and similar in 

 form and size to those that clothe the 

 large dorsal spines. On each arm there 

 are foimd next — beside the above des- 

 cribed spines, wliich form the 'castle ' 

 and can not be refen-ed to the arms 

 — 3 stout conical spines (exceptional- 

 ly 2 or 4), the two on the inner part 

 of the arm, the third close to its 

 apex, all resting on the median row 

 of plates ; also two (exceptionally 1 

 or 3) on each side projecting in a 

 somewhat obhque direction from two 

 (1-3) of the superior marginal plates, 

 which lie near the apex of the arm. 

 Number of marginal plates c. |f ; the 

 inferior ones present nothing worth 

 noting ; pedicellarise are absent from 

 both. There is found, however, here 

 and there single large pedicellaria 

 on the ventral plates, the covering of 

 which consists among others of grains 

 of very different size, 2-6 large tablet- 

 shaped grains, surrounded by several 

 small, but angular and flat ones simi- 

 lar to the larger ; as in other Oreaster 

 species a naiTow belt of these ventral 

 plates is continued on to the apices 

 of the arms between the ambulacral 

 fiUTOWS and the marginal plates. The 

 inner foot papillae are veiy fine, 6-7 

 in each gi'ouj), but of the foim usual 

 in this genus ; the outer are broad, 

 flat and blimt, two for each group of 



