Goniocidaris tubaria, /. ;W - SO. 



li-2, 33. Lmge iibiictimd inteminbulaerul spines. 



34, 35. Short, cuiiulifnnn, iibaclinal inti'nmilHilacial spines. 



34". Miu;nitieil enil view o{ Ki^. 34. 



3(i. Small actiual interamlmlacral spine. 



Porocidaris purpurata, /. J7 - Jfl. 



37. Lai>;e abactiual iiiteranibulacval pointed serrated spine, with the collar reaching hall 



the length of the shaft. 



38. Shorter, pointed, smooth interamViulacral abaclinal .spine. 



39. Flattened, fluted, imd seiTated interamlnilacral abactinal spine, near ambitus. 



4(1, 41. Large and small, flattened, pointed spines, with serrated edges, from the actinal 



side. 

 40». Flat actinal spine, somewhat magnified. 



