STARFISHES OF THE PHILIPPINE SEAS. 193 



ing conspicuously upon actinal surface; inferomarginals with more 

 than 1 accessory spinule proximally, adambulacral furrow spines 

 8 to 10. In a hirge specimen E = 95 mm., r=:12.5 mm., R=7.5 r; 

 breadth of raj^ at base, 15 mm. (Station 5447.) 



Description. — Abactinal spines variable in number, but more nu- 

 merous than in Ch. inops and scattered all over the abactinal area; 

 numerous in the type. Larger paxillae of disk with 10 to 15 short, 

 pointed spinelets in 1 or 2 circles around the spine. On the ray the 

 paxillae are spaced (one-half to their own diameter apart) and have 

 5 to spinelets. Xo abactinal pedicellariae. 



Superomarginal plates wdth the dorsal surface broader than long 

 proximally (in large specimens) and longer than broad distally; 

 in small specimens they form a conspicuous border to the abactinal 

 area, but the plates are narrower than long. Each plate is tumid, 

 and separated from the adjacent plates by a prominent, oblique 

 groove. Each bears nearer the outer than inner margin a sharp taper- 

 ing spine equal to the length of 1.5 to 2 plates. The first 2 spines 

 are shorter. General surface of plate covered with upright spaced 

 spinelets similar to those of the paxillae. Superomarginals 48 in 

 largest specimen (that used for description). 



Inferomarginals also tumid actinally and laterally; and proxi- 

 mally wider than long, the actinal surface becoming narrower dis- 

 tally. There is a stout, tapering, sharp, lateral spine equal to a 

 little less or a little more than the length of 2 plates. In addition 

 to this there are proximally 2 or 3 unequal accessory spinules below 

 or internal to the principal spine, these gradually reduced to 1 dis- 

 tally which may be one-half to three- fourths the length of the prin- 

 cipal spine. In small specimens only 1 accessory spinule is present. 

 The plates are covered with short spinelets, several of which near 

 the lateral spines are slightly enlarged. 



Actinal intermediate plates extending, in the largest specimen, to 

 the third inferomarginal and covered with numerous slightly spaced 

 subpapilliform, pointed spinelets, with usually also 1 or 2 central 

 enlarged spines (except in some young specimens, station 5619). 



Furrow spines 8 to 10, usuall}'' 9 or 10, but in small specimens 

 sometimes 7, and similar to those of Ch. inops. Along the adoral 

 transverse margin of the plate are 3 or 4 spinelets and a slightly larger 

 spinelet stands aborad of the subambulacral spine, which is promi- 

 nent and carried on a central prominence of the plate. On the outer 

 third of the ray the accessory spinelet moves inward and stands 

 between the subambulacral and the aboral, inner corner of the plate. 

 It is lacking in small specimens, except sometimes close to the end 

 of the ray. The number of adambulacrals to first 10 inferomar- 

 ginals, 14 or 15. 



