224 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



Actinal intermediate plates in 5 chevrons and an odd plate adja- 

 cent to margin, the plates nearest the furrow being the largest and 

 extending to tenth or eleventh inferomarginal, while the second 

 series extends to the seventh or eighth. The plates are armed with 

 1 to 3 tapering, sharp spines about as long as the width of the plate, 

 the periphery being occupied hj short, sharp, spaced spinelets. On 

 the transverse margins of the first series of plates the spinelets are 

 stouter and round-tipped and form, with their companions of the 

 adjacent plate, a pectinate pedicellaria over the suture. These fas- 

 ciolate pedicellariae are not constant. In the type they extend 

 about half the length of the first series, but in the cotype from the 

 same station they are confined to the first few plates. The proximal 

 pedicellariae have 6 or 7 spines in each comb. 



Adambulacral plates longer than wide, with a very angular furrow 

 margin bearing 8 or 9 subequal, rather short, compressed, blunt 

 spines. On the outer part of the ray those on the angle of the 

 apophysis separate consecutive pairs of tube feet, while the lateral 

 numbers have their broader side to the furrow and act presumably 

 as protectors of the underlying feet. There are 1 or 2 tapering, 

 pointed, subambulacral spines, proximally about as long as the fur- 

 row spines, distally longer, partly surrounded by 5 to 10 shorter, 

 bluntly pointed, spaced spinelets, which stand on the margin of the 

 plate, with occasionally 1 or 2 between the subambulacral and the 

 apex of the furrow angle. 



Mouth plates convex actinally, with a broad median suture. 

 Furrow spines, 8 or 9, stout, blunt, very similar to the corresponding 

 adambulacral spines, the inner 2 or 3 being compressed and slightly 

 longer than the others. The unpaired median mouth spine is com- 

 pressed, heavy and blunt, and largest of all. A series of 9 or 10 

 stout, rather short, pointed spines follows the median suture margin 

 and another series of 4 or 5, close to them, continues the furrovv^ 

 series along the lateral suture margin. 



Madreporic body small, convex, with coarse ridges, and situated 

 a little nearer center than margin. 



Superambulacral plates present. Gonads in a single tuft on either 

 side of the interbrachial septum. 



Type.— Cdit. No. 30534, U.S.N.M. 



Type-locality.— StSLtion 5609, Gulf of Tomini, Celebes (lat. 0° 11' 

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

 ture 36.3° F. ; 2 specimens. 



Distribution. — Known only from the Gulf of Tomini, Celebes, 

 1,089 to 1,092 fathoms; bottom temperature 36.3° F. 



Specimens examined. — Three; besides the types, 1 from station 

 5608, Gulf of Tomini, 1,089 fathoms, gray mud, bottom temperature 

 36.3° F. 



