Plate XVI. 



I, 2, 5— lo, 22, 24, 25, 27, 29, 31, 32, 34 Spalangns purpureus. 17, 23, 28 Spat. Raschi. 11, 19 Spat, a/tus (} Liitkeni). 

 3, 4, 13 — 15, 20, 30, 33 Macropneustes spaiangoides. 12 Echinocardiuin capense. 16 £'ir^. mediteyraneum. 18 Ech. petinatijiditm. 



21 iJc/i. cordatiim. 26 £c//. flavescens. 



Fig. I. Spatangus purpureus, valve of large tridentate pedicellaria, side view. (Comp. Fig. 9). 70/j. 



— 2. — — triphylloiis pedicellaria. ^^/j. 



^ 3. Macropnetistes spatangoidcs (cChallenger , St. 33), valve of short tridentate pedicellaria. 5°/,. 



— 4. — — — — — - ophicephalous — 7°/i. 



— 5. Spatangus purpureus, ophicephalous pedicellaria. 70y'j. 



— 6. — — valve of ophicephalous pedicellaria. '75/i- 



— 7. — — — - short tridentate • — 7°/i. 



— 8. — — short tridentate pedicellaria. 37/,. 



— 9. — — valve of large tridentate pedicellaria, from the inside. (Conip. Fig. i). 7o/j. 



— 10. Spatangus purpureus, — - short — — side view. hq/j. 



— II. — alttis (Liitkeni}), valve of short tridentate pedicellaria. ?%. 



— 12. Echinocardiiun capense, — - triphyllous — ^■'°/i- 



— 13. Alacropneusfes spatangoides (Challenger.;, St. 33), valve of short tridentate pedicellaria. 37/,. 



— 14. — — («Albatross», St. 2655), — . _ — — 50/,. 



— 15. — — («Challenger», St. 33), — - — triphyllous — '75/,. 



— 16. Echinocardium mediterranezim, valve of triphyllous pedicellaria. 24°/,. 



— 17. Spafangiis Raschi, valve of short tridentate pedicellaria. 7°/,. 



— 18. Eckinocardiujn pennafijidiiiii, valve of triphyllous pedicellaria. 240/1. 



— 19. Spatangus altus (Liitkenil), valve of short tridentate pedicellaria. 70/,. 



— 20. Macropneustes spatangoides (« Challenger*, St. 33), valve of large tridentate pedicellaria. 37/,. 



— 21. Echinocardium cordatunt, valve of triphyllous pedicellaria. ^4°/,. 



— 22. Spatangus ptirpureus, — - — — "S/,. 



— 23. — Raschi, — - tridentate — so/,. 



— 24. — ptirpureus, subanal area of a specimen 4"'™ in diameter. '5/,. 



— 25. — — valve of tridentate pedicellaria. 7°/,. 



— 26. Echinocardium flavescens, valve of triphyllous pedicellaria. ^40/,. 



— 27. Spatangus ptirpureus, valve of small tridentate pedicellaria. '40/,. 



— 28. — Raschi, — - large tridentate — 70/,. 



— 29. — purpureus, specimen 4™'" long, actinal side. 's/,. 



— 30. Macropneustes spatangoides (« Challengers, St. 33), tridentate pedicellaria. 35/,. 



— 31. Spatangus purpureus, specimen 4""" long, side view. '5/,. 



— 32- — — subanal area of a specimen 9""" in diameter. 7i- 



— 33- Macropneustes spatangoides («Challenger», St. 33), large tridentate pedicellaria. 30/,. 



— 34. Spatangus ptirpureus, specimen 4""" long, abactinal side. "5/,. 



