U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 90 PLATE 66 



Plazaster borealis (Uchida): 1, Pedicellana from abactinal spine, (I.,Vj mm. long, X K'O; 2, same, 

 0.45 mm., X 1"0; 3, interior of jaw of a pedicellaria showing the numerous teeth in several 

 series, X 200; 4, a single jaw, X 200; 5, abactinal spinelet, 1.4 mm. long, X 25; 6, skeleton 

 of ray, near base which is to the right, from the adambulacrals to midradial line, X 5 (/, infero- 

 marg'inals; S, probable superomarginals); 7, three adanibulacral plates from near middle of ray. 



ith adjacent inferomarginal (/). X 10. 



