ASTEROIDEA OF NORTH PACIFIC AND ADJACENT WATERS— FISHER 139 



Specimens of Lethasterias nanimensis chelifera examined — Continued 



Genus ORTHASTERIAS Verrill 



Orthasterias Verrill (part), Shallow-water Starfishes, 1914, p. 168 (48). — Fisher, Ann. and 

 Mag. Nat. Hist., ser. 9, vol. 12, 1923, p. 257 (emended). 



Diagnosis. — Coscinasteriinae differing from all others in having a well-developed 

 series of actinal spines bearing a small tuft of crossed pedicellariae; inner as well as 

 outer inferomarginal spine with cluster of pedicellariae; crossed pedicellariae without 

 any of the terminal teeth enlarged; straight pedicellariae large, broadly lanceolate, 

 compressed to spatulate, denticulate or unguiculate; oral carina narrow composed of 

 from three to five pairs of contiguous postoraladambulacral plates; actinos tome sunken; 

 carinals and superomarginals directly imbricated in series, without interpolated sec- 

 ondary oblong ossicles; two to three (or equivalent) series of dorsolated plates, joined 

 by secondary ossicles into a close-knit, irregular skeleton; adambulacrals diplacanthid. 



Rather large, slender to stout rayed, small-disked sea stars, of a bright red color 

 mottled with tawny or yellowish, having numerous prominent abactinal spines, 

 rather heavily sheathed and provided with a conspicuous ruff of pedicellariae; three 

 definite series of ventrolateral spines, adjacent to adambulacrals, each with a tuft of 

 pedicellariae. 



ORTHASTERIAS KOEHLERI (de Loriol) 



Plate 47, Figure 4; Plate 51, Figure 2; Plate 62, Figure 4; Plate 64, Figure 3; Plates 65-72 



Asterias koehleri P. de Loriol, Notes pour servir a 1'dtude des fichinodermes V., Mem. Soc. 



Phys. et d'Hist. Nat. Geneve, vol. 32, No. 9, 1897, p. 21, pi. 3 (18), figs. 3, 3a-3d. 

 Orthasterias columbiana Verrill, Shallow-water Starfishes, 1914, p. 168, pi. 24, figs. 1, 2, I; 



pi. 35, fig. 1; pi. 65, fig. 2; pi. 78, figs. 1, U; pi. 79, figs. 3-3c; pi. 109, figs. 2-26. 

 Orthasterias biordinata Verrill, Shallow-water Starfishes, 1914, p. 173, pi. 63, figs. 1, 2; 



pi. 82, figs. 2-26. 

 Orthasterias koehleri Verrill, Shallow-water Starfishes, 1914, p. 175, pi. 75, figs. 3, 3c. 



Diagnosis. — Same as that of genus. 



Description. — The extremes of variation in this species include forms with slen- 

 der, tapering, sharp spines (varying in number and spacing) contrasted with others 



