NO. 1944. NEW GENERA AND SPECIES OF STARFISHES— FISHER. 625 



wider than long; actinal intermediate plates in 10 or 11 very regular 

 chevrons, and extending to the end of the ray; half way along ray 

 about 5 actinal intermediate plates in a transverse series (8 or 9 in 

 tizardi); intermediate plates with spaced cylindrical, upright paxil- 

 lifoiTii groups of slender spines; adambulacral armature rcsembhng 

 that of M. tizardi, but with 13 or 14 (instead of 15 to 20) spinelets, 

 2 or 3 of which, about 1 ^ plates in length, and considerably stouter 

 than the rest, occupy the furrow margin. 



Tyj^e.— Cat. No. 30533, U.S.N.M. 



Type-locality. — Station 5630, vicinity of Bat j an Island (south of 

 Patiente Strait), Molucca Islands (lat. 0° 56' 30" S.; long. 128° 05' 

 E.), 569 fathoms, coral sand, mud. 



PSEUDARCHASTER OLIGOPORUS, new species. 



Nearest to Ps. pedinifer Ludwig and Ps. dissonus Fisher. R=87 

 mm., r = 21 mm., R = 4.1 r; breadth of ray at base, 24 mm.; rays 

 slender, long, and very attenuate at the extremity; side of ray low, 

 rounded; marginal plates small, especially distally, where supero- 

 marginals are confined to side wall of ray and are longer than wide, 

 square, or slightly wider than long; papular area restricted to center 

 of disk and petaloid radial areas extending about \ the length of 

 ray; abactinal plates tabulate on papular area, the roundish tabula 

 low, spaced, and bearing 20 to 30 polygonal granules; outside of 

 papular area, plates elliptical or oblong, arranged in oblique trans- 

 verse series and with very low tabulum, or distally none; supero- 

 marginal plates with coarse, spaced, round granules; mferomarginals 

 with pointed, conical, appressed spinelets, and proximally 8 to 12 

 appressed, sharp spines in a zigzag transverse series, these becoming 

 reduced to 1 or 2 toward the extremity of ray; actinal intermediate 

 plates in 5 chevrons, the series adjacent to adambulacrals with the 

 transverse sutures armed with fasciolate pectinate pediceUarise, the 

 spinelets being short and broad-tipped; furrow series angular with 

 8 or 9 short, sometimes slightly compressed, blunt or bluntly pointed 

 spines and 1 or 2 tapering, pointed, subambulacral spines, surrounded 

 by 5 to 10 shorter, spaced, pointed spinelets. 



Type.— Cat. No. 30534, U.S.N.M. 



Type-locality.— station 5609, Gulf of Tomini, Celebes Gat 0° 11' 

 S.; long. 121° 16' E.), 1,092 fathoms, green mud; bottom tempera- 

 tm'e,36.3°F. 



This abyssal form differs from Ps. pectinifer and Ps. dissonus of 



the east and north Pacific in having longer and slenderer rays, the 



distal portion being especially attenuate; smaller'marginal plates; a 



very restricted papular area; smaller and distinctly spaced tabulate 



48702°— Proc.X.M.vol.43— 12 40 



