JAPANESE ASTEKOIDEA. 



247 



shoi-ter armed individuals have wider and more massive marginal plates, 

 but tliis is not invariably the case. The extreme variants in proportions 

 are foimd at the same station. 



"Young. — The smallest specimen (station 4538) measm-es E,=8mm., 

 r = 6 mm.; rays broad, stout, blmit, with seven rather massive supero- 

 marginals, wliicli are larger relatively than in adults. Paxillse with nine or 

 ten peripheral and two to five central spinelets ; adambulacral plates with 

 fom" furrow spines. Terminal jilate small. Tliis species has much larger 

 marginal plates than equal sized Psendar chaster pvsilhis, and the latter 

 species has veiy large terminal plates and spiny inferomarginals, so that 

 there is no danger of confusing the two forms in a superficial examination. 



" Type.— Cat. No. 21926, U.S.N.M. 



" Type-locality. — ^Albatross station 3310, vicinity of Unalaska, Alaska, 

 58 fathoms, on fine dark sand and mud. 



" Distribution. — Bering Sea (vicinity of Pribilof Islands and west of St. 

 Paul) to southeast Alaska, and off Monterey Bay, Cahfornia ; on the Asiatic 

 side to the Sea of Japan. Bathymetrical range, 32 to 688 fathoms in 

 Bering Sea and northern pai-t of range, to 871 fathoms off Monterey Bay. 

 Foimd on fine gray or black sand, gi-een mud, or on j)ebbles. 



" Specimens examined. — The following is a complete hst of locahties 

 from which one hundred and seventy-eight specimens have been examined : 



" Specimens of LeptycMster anomalus examined. 



