26 Proceedings of the Biological Society of Washington. 



Genus CORONASTER Perrier. 



Coronaster Perrier, Ann. sci. nat. , art. 8, 1885, p. 13. Type, C. parfaiti 

 Perrier; Exped. sci. du Travailleur et du Talisman, Echinodermes, 

 1894, p. 92, pi. 8. 



Stolasterias (subgen.) pars Si.aden, Challenger Asteroidea, 1889, p. 584. 



Heterasterias Verrill, Shallow-water Starfishes of the North Pacific 

 Coast, etc., 1914, p. 46. Type, Asterias {Stolasterias) volsellata Sladen. 



Coronaster halicepus new species. 



Characters. — In general appearance very closely resembling C. volsella- 

 tus, but differing in having 10 rays, 2 adambulacral spines, relatively 

 broader and shorter major, unguiculate pedicellarise, with longer claws, 

 heavier ambulacral forficiform pedicellarise with the jaws conspicuously 

 crossed at tips, and longer forcipiform minor pedicellarise, each jaw with 

 upward of 12 or even more small teeth in addition to the large terminal 

 teeth (5 or 6 in volsellatus). R=260mm., r=17mm., R=15±r; breadth 

 of ray at base, 11 mm. ; at 25 mm. from base, 14 or 15 mm. 



Type.— Cat. No. 37,012, U. S. Nat. Mus. 



Type-locality. — Albatross station 5281, between Lubang and Luzon, 

 Philippine Islands, 201 fathoms, dark gray sand, bottom temperature, 

 50.4° Fahr. Taken also off the Molucca Passage, Molucca Islands, 298 

 fathoms. 



The adambulacral spines form the most trenchant character to separate 

 this species from volsellatus. They are 2, slender, slightly tapered, blunt, 

 situated on the furrow margin in an oblique series, the inner being aboral 

 to the outer and about two-thirds to three-fourths as long; the latter is 

 one-half to three-fifths as long as the inferomarginal spine. About every 

 other plate has on the furrow face 1 or 2 forficiform pedicellarise about 1 

 to 1.25 mm. long. These extend between the tube-feet, and are at the 

 end of a thick, apparently highly extensible stalk, around the base of 

 which are 1 to several very small pedicel 1 aria'. These pedicellarise have 

 the ends of the jaws crossed and are broader than in volsellatus, where 

 the jaw tips fit together snugly. The trabecule of the abactinal and 

 lateral skeleton, and the papular areas, have numerous large six-clawed 

 unguiculate, hand-shaped, pedicellarise, about 1.5 mm. long. These 

 resemble two miniature hands clasped, with the fingers bent, and are 

 shorter and broader than in volsellatus, as well as much more numerous. 



