84 BULLETIK 100, UNITED STATES NATIONAL MUSEUM. 



Actinal intermediate plates 5 or 6, each with a spiniform pedicel- 

 laria with 4 to 6 jaws. 



Mouth plates similar to those of A. eremicus but the spines in two 

 definite, regular longitudinal series to each plate, not irregular. 

 Marginal series angular with 7 or 8 spines, slightly shorter than the 

 lateral furrow spines, the 2 inner abruptly enlarged to form stout, 

 blunt teeth; the series is continued adjacent to first adambulacral in 

 about 5 little spinelets. The superficial series contains 7 or 8 much 

 thicker, bluntly pointed, lanceolate spines (in line with the inner 

 tooth) the outer 1 or 2 slightly enlarged. 



Madreporic body near to but not touching superomarginals. It 

 is small, partly obscured, and crossed by few, coarse striae radiating 

 from the middle of the adcentral side. 



Color in alcohol, bleached yellowish or brownish. 



Variations. — The chief variations in armature have already been 

 indicated. It remains only to point out that the smaller specimens 

 have relatively shorter rays, although still slender. A specimen from 

 station 5112 measures as follows: E=35 mm., r=6 mm., R=:5.8 r; 

 breadth of ra}^ at base, 6 mm. 



Type.— C^ii No. 30512, U.S.N.M. 



Type-locality. — Station 5112, Balayan Bay, southern Luzon, 177 

 fathoms, dark green mud. bottom temperature 52.4° F. 



Distrihution. — Off southern Luzon, Philippine' Islands. 



Specimens examined. — Seven from the following stations: 



Station 5111, Balayan Bay, southern Luzon, 236 fathoms, green 

 mud ; 1 specimen. 



Station 5112, same locality, 117 fathoms, dark green mud; 4 

 specimens. 



Station 5363, same locality, 180 fathoms; 1 specimen. 



Station 5365, same locality, 214 fathoms; 1 specimen. 



Remarks. — This species, while resembling Astropecten eremicus^ 

 differs in having longer and slenderer rays, small tubercular spines 

 on the first few superomarginal plates, only three furrow spines, no 

 adambulacral pedicellariae, mouth plates with two regular length- 

 wise series of spines, no small spine near the inner end of the infero- 

 marginal plates, very few abactinal pedicellariae, terete, or clavate 

 spinelets on the surface of the superomarginal plates. The mouth 

 spines are not irregular, but arranged in two regular longitudinal 

 series on each plate. 



ASTROPECTEN TENELLUS Fisher. 



Plate 11, figs. 1, 2 ; plate 15, figs. 1, la-b. 

 Astropecten tenellus Fisher, 1913o, p. 606.— Doderlein, 1917, pp. 50, 176. 



Diagnosis. — Very similar to Astropecten griegi Koehler, from 

 which it differs in having a few abactinal pedicellariae among the 



