E,EPOET ON THE ECHINOIDEA. 317 



Fig. 20. Genicopatagus affinis, profile of large-headed, S^iatangoid-like pedicellaria. 



„ 20'. „ ,, different view of another pedicellaria of same kind. 



„ 21. „ ,, interior view of base of same pedicellaria. 



„ 22. ,, „ magnified view of upper extremity of rod supporting 



pedicellarise. 



,, 23. Genicopatagus affinis, general view of upper extremity of rod. 



,, 24. „ „ portion of shank of rod. 



,, 25. Cystechinus ivt/viUii, magnified interambulacral spine. 



„ 26. ,, ,, rod supporting the pedicellariae of fig. 27. 



,, 27. „ ,, Clypeastroid-like pedicellaria. 



5, 28. „ „ large-headed (Si^atangoid-like) pedicellaria. 



„ 29. Cystechinus clypeatus, one of the club-shaped interambulacral spines magnified. 



,, 30. „ „ extremity of a large-headed, small pedicellaria, seen from 



the exterior. 



,, 31. Tip of same as fig. 30; magnified. 



„ 32. Cystechinus vesica, magnified view of interambulacral spine. 



„ 33. ,, ,, tip of rod carrying the Clypeastroid-like pedicellaria of 



fig. 35. 



„ 34. Cystechinus vesica, extremity of interambulacral primary spine ; magnified. 



,, 35. ,, „ Clypeastroid-like j)edicellaria. 



„ 36. ,, ,, interior view of large-headed pedicellaria. 



„ 37, 38. Spatagocystis challengeri, upper extremity of rods carrpng large-headed 

 pedicellarise. 



„ 39. Spatagocystis challengeri, profile of large-headed pedicellaria. 



„ 40. ,, „ interior view of base of same. 



„ 41. ,, „ interior view of large-based, slender-pronged pedi- 



cellaria. 



,, 42. Spatagocystis challengeri, interior view of base of small-based, long-pronged 

 pedicellaria. 



,, 43. Spatagocystis challengeri, exterior view of short-headed, toothed, cup-pronged 

 short-stemmed pedicellaria. 



„ 44. Echinocrepis cuneata, profile of large-headed pedicellaria. 



,, 45. ,, ,, extremity of rod carrying same. 



,, 46. Pourtalesia carinata, profile of large-headed, coarsely-reticulated, hooked pedi- 

 cellaria. 



„ 47. Interior view of a pedicellaria of same kind as fig. 46. 



„ 48. Pourtalesia carinata, large-headed pedicellaria, seen partly in profile. 



,,49. ,, ,, large-based, slender-pronged valve, seen from interior. 



,, 50. ,, „ another large-headed, closely-reticulated pedicellaria valve. 



