EXPLANATION OF PLATE XXXV. 



Figure 265. — Leptosynapta Girardii, (p. 716;) anterior part of the body, enlarged one- 

 half. 



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

 magnified. 



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

 removed, natural size; «, ambulacral zones; b, interamhulacral 

 zones. 



268. — Strongylocentrotus Drohachiensis, (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 265, 2C6 were drawn by A. E. Verrill ; 207, 2C9 were copied from A. Agassiz; 208, 270 were 

 drawn by E. S. Morse.) 



