Plate 39 

 All figures Ralhbunaster californicus 



Fig. 1. Marginal and adambulacral spines at middle of ray, viewed from side, X10. The uppi r 

 spineis a superomarginal; below are two inferomarginals; three groups of papulae, la. 

 An isolated abactinal plate and spine, ■ 10. lb. Arrangement of skeleton of side < I 

 ray at the end of proximal third, station 4339, ■ 10. Above are three isolated 

 abactinal plates; AD, adambulacral plates; /, inferomarginals; S, superomarginals, 

 the median rudimentary and without spine. 



2. Section of actinostomial ring from above, X 10; 0, odontophore. 



3. Mouth plates, and first adambulacrals {AD), 5, station 2925. Some specimens have 



two suboral spines; less often then' are three marginal spines per plate. 3a. Mouth 

 plates and first adambulacrals, cleaned, > 10. 



4. Straight pedicellaria, rather larger than usual, base of ray, station 31S6, X50. 4«. A 



crossed pedicellaria from superomarginal spine, 0.35 mm. long, X150. 

 1200 



