PLATE XX. 



Fig. 1. Ophiothrix galapagensis Ltk. & Mrtau.. Ventral side ^ 



Dorsal side. \'^- 



xVrm-spincs- ^- 



Fig. 2. 

 Fig. 3. 



Fi«r, 4, Uy b. 



a 



u 



« 



£f 



4i 



U 



Spines of the disk. Soibcrt Obj. 11. Oc. 0. 



u 



ti 



a 



n 



ii 



ii 



a 



Dorsal side. § 



Fig. 5. Sigsheia lineata Ltk. & Mrtsn. Ventral side. 



Fig. 6. 



Fig- 7. 

 Fig. 8. 



8 



f 



Arm-joints in side view, f . 



