EXPLANATION OF PLATE XXXV. 



FIGURE 265. Leptosynapta Girardii, (p. 71C ;) anterior part of the body, enlarged one- 



lialf. 

 266. The same ; perforated plates from the skin, and the &quot; anchors,&quot; highly 



magnified. 

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



removed, natural size; a, arnbulacral zones; &, interambulacral 



zones. 



263. 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 265, 266 wore drawn &quot;by A. E. Yen-ill ; 267, 269 were copied from A. Agassiz; 268, 270 were 

 drawn by E. S. Morse.) 



