Boone, Echinodermata, Gruises of "Eagle" and "Ara" 1921-28 81 



the spines is paved with small, unequal, polygonal granules, inter- 

 spersed with small, bivalve pedicellariae. These granules also sur- 

 round the bases of the spines. The papular areas are very large and 

 conspicuous, with numerous single papulae. The superomarginal 

 plates are not very large; about 18 to 24 occur on each side of each 

 ray in big sea-stars. They form the margin, but have their outlines 

 concealed by the thick covering of granulose skin, and usually two to 

 four short, stout, conical spines. Their granules are coarser than those 

 further up on the disk and have quite numerous small, bivalve pedi- 

 cellariae among them. The inferomarginal plates are quite similar 

 in size and shape to the superomarginals and are placed well on the 

 actinal side, except well toward the tips of the rays. They are granu- 

 lated similar to the upper plates and each plate normally bears a 

 cluster of three to five or more short, conical spines, the larger of 

 which are much smaller than those of the superomarginals and quite 

 like those of the interactinal plates. These latter are arranged in 

 simple, divergent rows and the plates and their sutures are covered 

 with large granules and pedicellariae, coarser than are found on the 

 abactinal side, but each plate usually bears a more prominent central 

 group of two, three, four, or more, short, stout, unequal, blunt spines. 

 Their pedicellariae are larger than those of the abactinal side, with 

 relatively wide valves. 



The adambulacral plates each bear a marginal series of three to four 

 small, flat, angulated, or blunted spines, and on the actinal face of 

 the plate there is one, occasionally two, larger, short, conical spines, 

 surrounded by coarse granules and numerous bivalve pedicellariae. 



References : Rumph. Muf . t. 15, fig. D, 1739. 



Pentaceros lentiginosis Linck, Stell., t. 41, fig. 72, t. 23, fig. 36. 



Stella marina maxima reticulata Sloane, Nat. and Civil Hist. Jamaica, 

 pt. II, p. 272, 1725. 



Asterias reticulata (part), Linne, Syst. Nat., ed. 10, t. 1, p. 661, 

 1758. — Retzius, Dissert., p. 14, 1805. — Lamarck, Anim. sans 

 vert., vol. II, p. 556, 1816. 



Or easier reticulatus Muller and Troschel, Syst. Aster., p. 45, pi. Ill, 

 fig. 2, 1842. 



Pentaceros reticulatus Gray, Ann. Mag. Nat. Hist., vol. 6, p. 276, 

 1840; ibid, Synopsis, p. 6, 1866. — A. Agassiz, North American 



