Natural Science, vol. vii. 



\Plat6 IX. 



ECHINOIUEA. 



Fig. I. Acrope rostrata, Thorns. Fig. 2. Cystechinus uyvilUi, A. Ag. • 

 spines removed. Fig. 3, Pourtalesia ccraiopygci, A. Ag. ; the abactinal surface, 

 covered with spines. All nat. size. Fig. 4. Hciniasier caveriiosus (Phil.) ; one 

 of the marsupial recesses, with eggs inside, x 5. 



