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rally one central and one or two rows of peripherals. Occasional- 

 ly I have observed paxillœ in which the differentiation into the 

 centrals and peripherals was not sharp, and sometimes the 

 spinelets were all fine and slender, exactly like the ordinary 

 peripherals. On the arms the paxillae are arranged in longitudi- 

 nal rows, of which I counted eleven at the base of an arm of a 

 specimen with E = 29.5 — 32.5 mm. and sixteen at the same place 

 of a specimen with Pi = 184mm. In the distal parts of the arms, 

 however, these rows become more or less irregular. 



Madreporite. — The madreporite is comparatively small and is 

 situated close to the margin of the disk, between two of the 

 arms. Although naked it is completely hidden from view by 

 the crowns of the surrounding paxillae. It is very slightly convex 

 and deeply crenate at the margin ; the grooves are mostly radiat- 

 ing (PL Y, fig. 88). 



Terminal lüate. — The terminal plate is small and incon- 

 spicuous because covered with granules similar to the coronal 

 granules of the paxillae. When denuded it is seen to have the 

 form of an incomplete ring. 



Locality. — My specimens are from the following locahties : 

 Misaki, Awa, Miyazu (Tango). The bathymetrical range appears 

 to be rather wide, there being specimens from the littoral region 

 as well as from a depth of 640 metres. 



Specimens in S.C, H.N.S., H.N.S.W. 



Eemarhs, — In small specimens, e.g. in one of R=: 29.5-32.5 

 mm., the armature of the mouth-plate is much simpler, and the 

 large pedicellaria) of the adambulacral plates are either absent or 

 imperfectly developed. 



