474 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



1 long, slender, pedicellaria, and sometimes by 1 or 2 additional 

 small ones. The pedicellariae are frequently as long as the longest 

 spinelets and the slender tips are often slightly curved. They 

 usually stand on the lower, transverse lobe of a plate. 



Prominent adambulacral plates with 1 spine deep in furrow armed 

 with 1 to several pedicellariae at its base (not always present) and 

 a terminal three-cornered sacculus covered with upward of 10 un- 

 equal, medium-sized, and small pedicellariae. This spine is usually 

 bent toward the nerve cord. Above this a row of 4 or 3 spines is 

 directed upward, the third usually the longest. The first, that above 

 the true furrow spine, has a large pedicellaria, shaped like a minia- 

 ture ibis beak, attached to its middle or its base. The second spine 

 sometimes has a similar pedicellaria. The outer end of the plate has 

 1 or 2 spinelets and 1 or 2 small pedicellariae. The nonprominent 

 plates have a small spine on the adoral furrow corner and on the 

 surface of the plate a group of 4 or 5 spines and spinelets, 1 to 3 

 near the aboral marginal being of conspicuous size and sometimes 

 forming an oblique series toward the outer adoral corner. Two or 

 3 small, slender pedicellariae stand on the outer margin of plate. 

 The figures will best show the disposition of the adambulacral spines. 

 See also the figures of a half-grown specimen with R, 115 mm. 



Madreporic body, medium sized, convex about half the diameter 

 of the adjacent basal plate. 



Young. — A specimen from station 5299 has R=53 mm., r=:5.5 mm., 

 R=:9.6 r. The carinal plates have a stout conical upright spine or 

 tubercle, but the other central spines are very slender, that of the 

 superomarginal scarcely longer than other spinelets on some plates. 

 Five series of lateral plates, including superomarginals. Prominent 

 adambulacral plates with transverse series of 3 or 4 spines, the 

 innermost with 1 large pedicellaria. The large pedicellariae guard- 

 ing the papulae are present only at the base of ray and on disk. 

 Tube feet in 2 series. 



Type.— C^t. No. 37008, U.S.N.M. 



Type-locality.— Station 5606, Gulf of Tomini, Celebes, 834 fath- 

 oms, green mud; 1 specimen. 



Distribution. — From southern Luzon to Celebes, 559 to 890 fath- 

 oms, bottom temperature 38.3° to 39.2° F. 



Specimens examined. — Four, the type and 1 from each of the fol- 

 lowing stations: 



Station 5299, China Sea, vicinity of southern Luzon (lat. 20° 05' 

 N. ; long. 116° 05' E.), 524 fathoms, gray mud, sand. 



Station 5582, vicinity of Darvel Bay, Borneo, 890 fathoms, gray 

 mud, fine sand, bottom temperature 38.3° F. 



Station 5648^ Buton Strait, Celebes (lat. 5° 35' S. ; long. 122° 20' 

 E.), 559 fathoms, green mud, bottom temperature 39.2° F. 



