318 THE VOYAGE OF H.M.S. CHALLENGEE. 



Fig. 51. Pourtalesia carinata, rod carrying the pedicellarige of figs. 46, 47. 

 „ 52. „ ,, magnified interambulacral abactinal spine. 



,, 53. Pourtalesia ceraiopyga, valve of large Clypeastroid-like pedicellaria. 

 „ 54. Valve of small pedicellaria of same kind as fig. 53. 

 „ 55. Pourtalesia ceratopyga, upper extremity of rod supporting the above. 

 „ 56. ,, „ broad based, slender-pronged, and hooked pedicellaria. 



„ 57. ,, ,, profile of large-headed coarsely-reticulated, hooked 



pedicellaria. 

 ,, 58. Interior view of another pedicellaria of same kind as fig. 57. 

 „ 59. Pourtalesia. ceratojoijga, small, large-headed pedicellaria, with smooth valvular 



edge. 



