606 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



ASTROPECTEN LUZONICUS, new species. 



Similar to A. eremicus, but with longer, narrower rays, a small 

 tubercular spine on the first few superomarginal plates; only 3 fur- 

 row spines beyond the first 5 or 6 plates; armature of each mouth 

 plate in 2 regular longitudinal series. Disk very small, rays long, 

 slender, and very flexible; paxillar area narrow; paxillse small, deli- 

 cate; lateral spines 2 or 3; furrow spines 3; subambulacral spines 

 2 to 4, none enlarged. R = 68 mm., r = 9 mm., R = 7.55 r; 

 breadth of ray at base, 9 to 10 mm. 



Type.— Cat. No. 30512, U.S.N.M. 



Type-locality. — Station 5112, Balayan Bay, southern Luzon, 117 

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



In this species the p axillae arc small and slender as in eremicus with 

 5 to 8 slender, blunt, membrane-invested spinelets, as long as or 

 slightly longer than the pedicel. Abactinal pedicellarise very few 

 and inconspicuous. vSuperomarginal plates, about 55 in number, are 

 similar to those of eremicus in form and position, but the central 

 spinelets are not sharp and squamiform as in eremicus; rather they 

 are blunt and clavate or cylindrical, and the first 5 to 10 plates bear 

 at the upper end of the plate* slightly spaced from the inner edge, a 

 small upright conical sharp spine, which rapidly decreases in size and 

 merges into the spinelets. Inferomarginal spines similar to those of 

 eremicus, but the small actinal spine is lacking except rarely on the 

 first 2 or 3 plates. No subambulacral pedicellariss; each actinal 

 interradial area with 5 or 6 pedicellarige having 4 to 6 spiniform jaws. 

 The mouth plates are similar to those of eremicus, but the spines are 

 in 2 definite, regular, longitudinal series on each plate. 



ASTROPECTEN TENELLUS, new species. 



Very similar to Astropecten griegi Koehler, from which it differs in 

 having a few abactinal pedicellarise among the paxillse, in lacking a 

 special spine on the distal superomarginals, in having very sharp, 

 flattened, inferomarginal spinelets, and proximally several spinules 

 along the aboral edge of the inferomarginal plates, ventral to the 

 lateral spines; in having the median furrow spine conspicuously 

 flattened, not cylindrical, in having, proximally, adambulacral 

 pedicellariae. Disk small, rays long and slender. R = 108 mm., r = 10 

 mm., R = 10.8 r ; breadth of ray at base, 1 1 mm. 



Type.— C&t. No. 30513, U.S.N.M. 



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

 Luzon, 146 to 200 fathoms. 



The paxillse are slender, with commonly a central spinelet sur- 

 rounded by 8 to 12 similar, delicate, terete, blunt spinelets, slightly 

 shorter than the pedicel. The superomarginals bear a tapering, 

 sharp, slightly flattened spine, about as long as the plate, on the 



