EXPLANATION OF PLA.TE LVIII. 

 ECHINOIDEA. 



Fihularia nutriens. 

 Fig. 1. — An ophicephalous pedicellaria. x 400. 

 Fig. 2. — Another, open, from another point of view, x 400. 

 Fig. 3. — Valve of a tridentate pedicellaria x 400. 

 Fig. 4.— Tip of a spine, x 400. 

 Fig. 5, — A female, natural size, from above. 

 Fig. 6.— The same, x 8. 

 Fig. 7. — Another from the side, x 8. 

 Fig. 8. — The same as fig. 7, from below, x 8. 

 Fig. 9. — A male, from above, x 8. 

 Fig. 10. — Interior view, abactinal half of test removed, showing 



intestine and lantern in position, x 8. 

 Fig. 11. — The same, with intestine and lantern removed, to show 



mouth and auricles, x 8. 



HOLOTHURIOIDEA. 



Molpadia dissimilis. 

 Figs. 12-15. — Calcareous tables from ' ^ iva,\l ; four discs, and 



a spire seen from the side, x 70. 

 Figs. 17-21.— Tables from the caudal appendage; four discs, and 



a spire seen from the side, x 70. 



Molpadia productamensis. 

 Figs. 22-26. — Calcareous tables from body wall ; three discs, and 



two spires seen from the side, x 70. 

 Figs. 27-30. — Tables from caudal appendage ; three discs, and a 



spire seen from the side, x 70. 



