86 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



either in a series or irregularly placed, which grade the spinulation 

 of the adambiilacrals into that of the inferomarginals. Sometimes 

 the enlarged subambulacral stands on the furrow margin, appearing 

 to form one of the furrow series. A few proximal plates may have 

 4 furrow spines (not counting a subambulacral out of position). In 

 a specimen from station 5518 the first and second plates bear a con- 

 spicuous conical subambulacral pedicellaria composed of about 6 

 spines. The type has 1 or 2 and a cotype has several, so that it 

 seems to be a constant character. 



The actinal intermediate plates are few and bear a tuft of spine- 

 lets about as long as the outer subambulacrals or a conical spiniform 

 pedicellaria. Pedicellariae are not mentioned in the description of 

 gHegi. 



The armature of the mouth plates (which are of the type of 

 eremicus and luzonicus) consists of a marginal series of 7 or 8, in- 

 creasing in length toward the inner end of the plate — the combined 

 plates having either 4 or 6 enlarged, blunt teeth. The superficial 

 spines are not in regular series, are numicrous, and coarse. They cor- 

 respond to about 2 series. 



Madreporic body less than its own diameter distant from supero 

 marginal plates and nearly obscured by paxillae. 



Type.—Q^i. No. 30513, U.S.N.M. 



Type-locality. — Station 5453, Albay Gulf, east coast of southern 

 Luzon, 146 fathoms. 



Distribution. — Southern Luzon to Mindanao Sea, Philippine Is- 

 lands, 146 to 200 fathoms. 



Specimens examined. — Eight ; 4 from the type-locality ; 2 from 

 station 5518, Mindanao Sea, off Point Tagolo, Mindanao, 200 fathom.-. 

 gray mud, globigerina, bottom temperature, 54° F. ; and 2 from 

 station 5268, Batangas Bay, Luzon, 170 fathoms, sand and shells. 



Eeinarhs. — The differences between this species and A. griegi (Bay 

 of Bengal, Indian Ocean, 130 to 464 fathoms) have been mentioned 

 in the diagnosis and description. It differs from A. eremicus in 

 having much longer, slenderer raj^s, superomarginal spines, only 3 

 furrow spines, and an enlarged subambulacral spine; and from 

 luzonicus in having the superomarginal spines extending far along 

 ray, not confined to the base: in having laiger paxillae, fe^er sub- 

 ambulacral spines, of which 1 is enlarged, no inferomarginal pedi- 

 cellariae, a few proximal subambulacral pedicellariae, and a row of 

 accessorj'^ inferomarginal spinules, below the lateral spines. The 

 superficial mouth spines are more numerous, and not in a single, 

 regular series, as in luzonicus. 



Astropecten imhellis Sladen from 100 fathoms off Tablas Island, 

 Philippine group, is a young form : Of the 4 species eremicus^ luzon- 

 icus. tenellus, and pedicellaris I think it can be confused only with 



