72 Bulletin, Vanderbilt Marine Museum, Vol. IV 



dorsal end of each inferoniarginal plate. The plates of the oral inter- 

 radial area are much smaller than the marginal plates and are flat, of 

 irregular size, closely placed. The adambulacral plates bear three to 

 five short, stout, conical, skin-encased spines set fan-wise along the 

 margin adjacent to the furrow ; the two median spines are the largest 

 of each series. The adambulacral furrows are quite wide; the tube- 

 feet stout, arranged in two longitudinal series. The two jaw-plates 

 of each ray are somewhat pear-seed shaped, encased in skin, which 

 bears numerous small, conical spines. The oral teeth are long, conical, 

 usually six, arranged in a stouter, median pair, and two, slenderer, 

 longer spines below these on each side of the median pair. 



References: Astropecten corniculatus Linck, De Stellis Marinis, p. 

 27, tab. 36, no. 763, 1733. 



Asterias crispata Retzius, Dissert, sist. species cognitas Asteriarum, 

 p. 17, 1805. 



Asterias polaris Sabine, in Parry's Journal of a Voyage for the Dis- 

 covery of a Northwest Passage, in 1819-20, Appendix, p. ccxxiii, 

 pi. 1, figs. 2, 3, 1821. — Verrill, Proc. Boston Soc. Nat. Hist., vol. 

 X, p. 356, 1866. — American Journ. Sci., 3rd ser., vol. 9, p. 420, 

 1876; vol. 49, p. 208, 1895.— Lutken, Vidensk. Meddel, Nat. 

 Forening., p. 28, 1871.— Bush, Proc. U. S. Nat. Mus., vol. VI, p. 

 246, 1883.— Perrier, Arch. Zool. Exper., vol. IV, p. 322, 1875. 



Asterias arancia Dewhurst, Nat. Hist, of Order Cetacea, etc., p. 283, 

 1834. 



Astropecten polaris Gray, Ann. and Mag. Nat. Hist., vol. VI, p. 180, 

 1840. 



Ctenodiscus polaris Muller and Troschel, Syst. Aster., p. 76, p. 129, 

 1842. 



Ctenodiscus pygmaeus Muller and Troschel, ibid, p. 76, p. 129. 



Ctenodiscus crispatus Duben and Koren, K. Vet. Akad. Handl., p. 

 253, 1844. — Ganong, Bull. Nat. Hist. Soc. New Brunswick, no. 7, 

 p. 49, pi. 3, fig. U, 1888.— Mortensen, Th., Echinod. British 

 Isles, p. 53, fig. 30, 1927. 



Anodiscus crispatus ( ?Val., Mss.) Perrier, Ann. Sci. Nat., 5e ser., t. 

 XII, p. 298, 1869. 



Ctenodiscus corniculatus Perrier, Revis. Stell. Mus., p. 380, 1876; 

 Arch, de Zool. Exper., t. V, p. 300, 1875. — Sladen, Rept. Voy. 

 "Challenger," Zool., Asteroidea, vol. XXX, p. 171, 1889.— A. H. 



