122 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



spines, the lowest but one usually the longest, and the lowermost 

 next longest, the former slightly exceeding the plate in length. 

 Underneath the upper members of this series, on the first few 

 plates, a rudiment of the second comb is usually present and the 

 first half dozen plates have a small solitary spinule near the middle 

 of the actinal surface and distal margin of the plate — a rudiment 

 of the actinal spines of luzonicus and euryactis. The actinal sur- 

 face of the plates is much narrow^er than in luzonicus and a trifle 

 wider than in multlcinctus. The general covering of the plates con- 

 sists of appressed, uncrowded, squamules round tipped at base of 

 ray. becoming pointed distally. 



Actinal intermediate plates small on the ray, a single series ex- 

 tending to the tenth inf eromarginal or less than one-third the length 

 of ray measured along side. For the length of 5 inferomarginals 

 beyond this point the series is continued by a variable number of 

 minute rudiments not visible unless the inner end of the inferomar- 

 ginals is cleaned of spinelets. In a transverse series between the 

 first adambulacral and inferomarginal are 5 small plates. The 

 plates bear spaced groups of 4 to 8 lanceolate, papilliform, blunt, 

 spinelets, the central one being sometimes enlarged. Several plates 

 adjacent to the adambulacrals bear a pectinate or fasciculate-pecti- 

 nate pedicellaria with 6 or 8 teeth. 



Adambulacral armature of the type of the foregoing species. 

 Furrow comb of 7 or 8 spines, the laterals the shortest, so that the 

 end of the fan has a curved contour. Proximal plates with 4 to 7 

 subambulacral spines in a single series, with a spine or 2 out of 

 line, and distally 8 or 10 in 2 or 3 series, all much shorter than the 

 furrow spines. On a few plates some of the spines form a simple 

 fasciculate pedicellaria, and are not appreciably modified. The first 

 and second plates are conspicuously compressed, the first with a 

 double pectinate transverse series of 14 to 16 spines. 



Mouth plates and armature similar to forgoing species. The 

 marginal spines below the base of the large inner tooth are short 

 conical and bluntly pointed and form a fascicular group of 6 or 7 

 resembling a pedicellaria. The portion of the series on a level with 

 the teeth consists of 3 or 4 small spines; the inner tooth is thick, 

 slightly tapered and blunt. The superficial spines are in 2 series 

 on each plate, the inner next to suture reaching the outer end of 

 plate and consisting of rather thick, blunt, lanceolate spinules; the 

 intermediate spines are irregularly placed, much smaller, and do 

 not attain the outer end of plate. 



Madreporic body medium-sized, the adcentral edge being at the 

 middle of r. 



Type.— C^t. Xo. 30523, U.S.N.M. 



