EXPLANATION OF PLATE XXXV. 



Figure 2G5.— Leptosynapta Girardii, (p. 716;) anterior part of tlie 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, amhulacral 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 265, 2G6 were drawn by A. E. Verrill; 267, 269 were copied from A. Agassiz; 268, 270 were 

 drawn by E. S. Morse.) 



