Plate I 1 



Fig. 1. Zoroaster euermanni, station I l'_':i. Adambulacral plates and two plates in each of I 



actinolateral series; dry, ■ 10. la. Same, station 1400. Armature of two adambula- 

 cral plates and one adjacenl actinolateral plate, alcohol specimen, 10. 16. Sa 

 station 142)!. A carina! spine, two abactinal pedicellariae and spinelet, 15. 



'J. /,. evermanni mordax, station 3073, for comparison with la; base of ray : alcoholic specimen, 

 X10. 



3. Myxodi nun platyacanthum rhomaleum, station 2890. I )orsal \iV» of one-fifth of actinostome 

 showing first superambulacral stays from above (s, s) I de e inclose (lie odontophore 

 in and two ampulla pores (a), •">. 3a. Same, Dorsal view of proximal end of 

 ambulacral ridge looking toward disk; s, superambulacral ossicles, 



I. Myxoderma sacculatum ectenes. Terminal plate of a young specimen, with 1! 17 mm., 10 

 tu- Same, type. Abactinal pedicellariae, base of ray, 16, 16 Same, station 1425, 

 R78mm. Abactinal skeleton of ray, 5; C,carinal; A, ad radial; S, superomarginal; 

 /. inferomarginal; ' first actinolateral. 



5. Myxoderma sacculatum. A section of ventral side of raj looking toward disk, the ambula- 

 cra! ridge in centei to show the enlarged first superambulacral buttresses S . t 



17.-. 



