U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 90 PLATE 67 



1-4, Lahldiaster annulatus Sladen: 1, Adambulacral and marginal plates, proximal third of ray, X 5 

 {A, outer adambulacral spine carrying pedicellariae shown in fig. 4; /, inferomarginal spine; 

 P, giant pedicellariae; S, superomarginal spine); 2, 3, one of the numerous giant pedicel- 

 lariae from the annular pads of tissue, two views, 1.7 mm. long, X 50; 4, a pedicellaria from 

 outer of the two adambulacral spines, 0.27 mm. long, X 100. 

 5, L. radiosus Liitken: Plan of skeleton of ray, the base to left, X 5 i-l, outer end of ambulacral 

 plates, dotted; .-/D, adambulacral plates; C, carinals; /, inferomarginals; ^, superomarginals). 



