Tank Nr. 



(fig. 5). much larger and generally with seven arms: 



fig. 3\ large and greenish, with pointed knobs; Astropecten 



tig. 1), with points like little tusks fringing the arms; Palmi- 



>o>, arms webbed, like a pentagonal piece of brick-red paper. 



"2. Brittle-Stars , with live, (rarely six) arms , thinner and more 



snake-like than the starfishes, round body like a thick halt- 



penny (Opldoderma, fig. 4). 



Feather-stars (Antedoti, fig. 6) mostly holding by their backs 

 to dead coral-stems (Antipathes, see tank 21) in the c entre of 

 the tank: they are \ellow or red and have ten plumed arms. 



3 



5. LuitHfi < i/iart\\ 

 1 4 nat. size. p. 65. 



Fig. 6. Antetlon rosacea, 

 attached to a branch of A)itii>alhes, 



a nat. size. p. 65. 



Sea-urchins, globular or bun-shaped, covered'with spines. Sphaere- 

 chinus (fig. 8), generally purplish, spines tipped white; Echinus 

 (p. 65), eight to ten inches across, spines white; Dorocidaris 

 (fig. 7), pink with knobs, bearing a few strong, stick-like spines. 



Fig. 7. Dorocidaris papilla^ >. 

 nat size. The sucker-feet are not-visible p. 



Fig. 8. Sphaerechinm (jrannlarix. 

 1 2 nat. size. p. 65. :A t^ 



