Phyllacanthua baculosa, /. 34 - 3S. 



34. Short, stout almctinal iiitonuiilmlaoral sjiine, coarsely serrated, flaring at tip. 



35. Sliort, pointed, smooth, ahactinal interambulacral spine. 



36. Short actiniJ iiiteranilmhieral spine. 



36". Still shorter actinal interambulacral spine, flaring at tip, with lamellar fluting, magnified. 



37. Long, pointed, fluted, and serrated interambulacral abactinul spine. 



38. Short interambulacral abactinal spine, with lamellar serration towards tip. 



Fbyllacanthus dubia, /. 39. 



39. Large abactinal interambulacral spine. 



PhyllaCcinthus verticillata, /. .JO - 4^. 



40. 41. Large interambulacral abactinal spines. 



40". Fig. 40 maguitiod, to show tlie gnuiular structure of the shaft, and the mode of formation 

 of the amiular swellings from large disconnected lamella;. 



42. Smaller interambulacral actinal spine. 



Stephanocidaris bispinosa, /. 4^. 



43. Large abactinal interambulacral spine. 



{All Figs, juitural size uidess otherwise stated.) 



