Plate XVI. 



I, 2, 5—10, 22, 24, 25, 27, 29, 31, 32, 34 Spatangns purpureus. 17, 23, 28 Spat. Raschi. 11, 19 Spat. altits ("? Ltitkeni). 

 3, 4, 13—15, 20, 30, 33 Macropncustes spatangoides. 12 Eckinocardium capense. 16 Æ-^. meditcrraiieum. iS Ech. pentiatifidum. 



21 Æt//, cordatimi. 26 £cA. fiavescens. 



Fig. I. Spatavgtis ptirpiirais, valve of large tridentate pedicellaria, side view. (Comp. Fig. 9). 7°/,. 



— 2. — — triphyllous pedicellaria. ^^/j. 



— 3. Macropneustes spatangoides («Cliallenger», St. 33), valve of short tridentate pedicellaria. 5°/^. 



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



— 5. Spatangtts piirpurciis, ophicephalous pedicellaria. 7°/i. 



— 6. ■ — — valve of ophicephalous pedicellaria. '75/,. 



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



— 8. — — short tridentate pedicellaria. 37/1. 



— 9- — — valve of large tridentate pedicellaria, from the inside. (Comp. Fig. i). 7°/,. 



— 10. Spafaiigiis purptirais, — - short — — side view. '40/j. 



— II. — altus (Lfttkcnil), valve of short tridentate pedicellaria. 7°/,. 



— 12. Ecliinocardhim capense, — - triphyllous — 24°/,. 



— 13. Macropnetistes spataiigoides («Challenger», St. 33), valve of short tridentate pedicellaria. 37/j. 



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



— 15- — — («Challenger::, St. 33), — - — triphyllous — 175/j. 



— 16. Echinocardium mcditerranewn, valve of triphyllous pedicellaria. 240/j. 



— 17. Spatangus Raschi, valve of short tridentate pedicellaria. 70/j. 



— 18. Ec/iiiiocardium pcnnatifidtiin, valve of triphyllous pedicellaria. 240/1. 



— 19. Spatangns altus (Liitkcnil), valve of short tridentate pedicellaria. 70/,. 



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



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



— 22. Spatangtis purpureus, — - — — 125/j. 



— 23. — Raschi, — - tridentate — 50/,. 



— 24. — pu,rpurcus, subanal area of a specimen 4"" in diameter. 'S/j. 



— 25. — — valve of tridentate pedicellaria. 70/j. 



— 26. Echinocardiuin fiavescens, valve of triphyllous pedicellaria. 24°/,. 



— 27. Spatnngus pu,rpureiis, valve of small tridentate pedicellaria. '4^/^. 



— 28. — Raschi, — - large tridentate — 7°/^. 



— 29. — purpureus, specimen 4"™ long, actinal side. 'S/i- 



— 30. Macropneustes spatangoides (.:Challenger», St. 33), tridentate pedicellaria. 35/,. 



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



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



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



— 34- Spatangus pnrpzireiis, specimen 4""" long, abactinal side. '5/,. 



