316 s. GOTO : 



whicli fit close together aucl form a compact pavement. The largest are 

 adjacent to the adarabiilacral plates, and these as well as tlie next one or 

 two series are a little broader than long, the breadth of each row diminish- 

 ing as it recedes from the fmTow. The remaining intermediate plates have 

 the length and breadth approximately equal, or they may be irregular or 

 trapezoid in shape. All the plates dismiuish in size as they approach the 

 margin, the plates at the extreme edge of the area adjacent to the infero- 

 marginal j)lates being very small. The surface of the plates is covered 

 with small, lo^v, uniform granules, which are arranged in straight series 

 along the margins of the x^lates, but show no definite order within this 

 boundary. In the row adjacent to the adambulacral plates nearly every 

 intermediate x^late bears a small excavate pedicellaria with two broad, low, 

 trancate, lamelliform valves, a little broader than high. Occasionally two 

 pedicellarire are present. Similar pedicellariœ are also j)i'6sent on a 

 number of plates in the neighbom-hood of the median interradial line 

 and in an ill-defined region parallel to, and a little removed from, 

 the infero-marginal plates. These pedicellai-isB on the intermediate plates 

 are of nearly uniform size tlu'ougliout, and there is no regularity in their 

 orientation. 



" The anal orifice is slightly excentric, and is surrounded by rather 

 larger plates than in the central region generally. 



" The madreporiform body, wliich is rather small and polygonal in 

 form, is situated at about one-third of the distance from the centre to the 

 margin. It is marked with fine, regular, sliarply convoluted, centrifugally 

 radiating striations. 



" Colom* in alcohol, a warm shade of light brown. 



" Locality.— ^tsktion 232. South of Yeddo (Japan). May 12, 1875. 

 Lat. 35° 11' 0" N., long. 139° 28' 0" E. Depth 345 fathoms. Bottom 

 temperatm-e 41°.l Falu\ ; sm-face temperature 64°.2 Fahr. 



" Remaries. — Pentagonaster japonicus is distinguished from Pentagonaster 

 patagonicus, to which it is most nearly allied, by the more regular penta- 

 gonal form, the sides being less curved, and the rays less produced. The 

 general granulation is finer. The structm*e of the paxillas and the armature 



