ECHINODERMES. 
1. Echinanthus rosaceus. Upper side. One-third natural size, covered 
with short purple or olive spines when alive. 
2. Oreaster gigas. Itis sometimes more than a footin diameter. Covered 
with hard knobs connected by low ridges. Bright red or orange, when alive. 
8,4. Cidaris tribuloides. 4. A small specimen in its natural state. 
8. Thesame after the spines have been removed, showing the knobs to which 
they are attached. One-half natural size. 
5. Diadema setosum. A ‘Sea Egg” with very long spines. Black, or 
banded with black and yellow. When the spines are removed it resembles 
fig. 3, but the knobs are smaller and more numerous. One-half natural size, 
