480 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1962 



Figure 13. — Skeletal characters of three orders of Ophiuroidea. A, Stenurida. B, 

 Oegophiurida. C, Ophiurida. Abbreviations: 0, ambulacra] element (vertebra); 1, 

 virgaiium-1 (sublateral); 2, virgalium-2 (lateral); 3, spines of lateral plate; 4, radial 

 groove; 5, primitive plates of dorsal integument; 6, secondary dorsal plate; 7, secondary 

 ventral plate. Compare with Figure 12. 



