466 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1962 



Figure 6. — Patterns of the skeleton in representative asteroids, illustrating the growth 

 axes described in the text. A, ventral aspect, and B, dorsal aspect, of Pentagonaster 

 (Goniasteridae); C, Lepty chaster; D, Astropecten; E, F, Persephonaster (all Astropec- 

 tinidae). G, H, I, Luidia; G, dorsal internal aspect of endoskeleton; H, transverse section 

 of arm (Luidiidae). Abbreviations: 1, ambulacral ossicle; 2, adambulacral ossicle; 3, 

 inferomarginal ossicle; 4, superomarginal paxilla; S, superambulacral ossicle; P, ambulacral 

 furrow. 



