EXPLANATION OF PLATE XXXV. 



FiGUUE 26'). — Leptosyuapta Girardii, (p. 716;) auterior part of the body, enlarged one- 

 half. 



266. — The same; perforated plates from the skin, and the " anchors," highly 

 magnified. 



267. — Echinarachnius parma, (p. 717 ;) upper surface with the spines partly 

 removed, natural size; a, ambulacral zones; h, interamhulacral 

 zones. 



268. — Strongylocentrotus Drobachiensis, (p. 716;) side view, natural size. 



269. — Asterias arenicola, (p. 718 ;) dorsal view, somewhat reduced. 



270. — Ophiopholis aculeata, (p. 719;) dorsal view, about one-half natural size. 



(Figures 2G5, 2GG were drawn by A. E. Yerrill ; 207. 2C0 were copied from A. Agassiz; 2C8, 270 were 

 drawn by E. S. Morse.) 



