STARFISHES OF THE PHILIPPINE SEAS. 207 



transverse series below the lateral spine. The general surface of 

 plate is covered with spaced, pointed spinelets longest on the well- 

 rounded surface between the ventral and lateral aspect of the plate, 

 and longer than the superomarginal spinelets. 



Actinai interradial areas rather large, the distance between the 

 inner edge of inferomarginals and outer end of mouth plates e(]ual- 

 ing first 3 inferomarginals measured on ambitus, or the distance be- 

 tween interradial suture of marginal plates and the distalmost in- 

 termediate plate. Each plate bears a few subequal, spaced, papiili- 

 form spinelets. Each interradial area bears 6 to 8 subcircular pec- 

 tinate pedicellariae, with 3 to 6 stout, sharp jaws. Sometimes a 

 pedicellaria consists of only 1 comb. 



Adambulacral plates with a semicircular furrow margin bearing 

 a fan-shaped group of 7 or 8 slender spines, slightly shorter than 

 their plate, the 2 or 3 median sometimes slightly shorter than those 

 spines immediately to either side. There is 1 subambulacral spine 

 about as long as its plate, and proximally 1 to 3 spinelets form a 

 more or less evident longitudinal series with the above. Distally 

 the subambulacral spine is not prominent and is accompanied by 

 1 to 3 spinelets only slightly smaller and all subequal to the furrow 

 spinelets. Seventeen (or 16.5) adambulacrals correspond to first 

 10 inferomarginals. ' 



Mouth plates broad, with 8 or 9 marginal spines, the inner the 

 longest, tapering, bluntly pointed, the rest subequal to the adambu- 

 lacral furrow spines and decreasing a trifle in length at outer end 

 of series. About midway between inner and outer ends of plate is 

 a short conical suboral spine, about as long' as the subambulacral. 

 Six or 7 spaced spinelets follow the median suture margin and about 

 3 the margin adjacent to first adambulacral plate. 



In addition to the actinai intermediate pedicellariae a small 

 pectinate pedicellaria occurs irregularly ventrally on the transverse 

 suture, between any of the first 5 inferomarginals, but never between 

 all of them. 



Madreporic body small, with few coarse striae, and situated twice 

 its diameter from the inner margin of the superomarginal plates. 



Type.— C^t, No. 32628, U.S.N.M. 



Type-locality. — Station 5651, Gulf of Boni, Celebes, 700 fathoms, 

 green mud ; bottom temperature, 38.7° F. ; 1 specimen. 



Distribution. — Known only from the type-locality. 



Remarks. — This Cheiraster has a very different appearance from 

 any others herein listed. The transverse series of 3 prominent spines 

 on the distal marginals is very characteristic and will serve to dis- 

 tinguish the species from Ch. suhtiiberculatus and Ch. granulatus 

 (see Ludwig, 1910, p. 456). The presence of only 1 prominent in- 



