Plate XVI. 



i, 2, 5—10, 22, 24, 25, 27, 29, 31, 32, 34 Spatangns purpureas. 17, 23, 28 S/tfA Raschi. 11, 19 5/W. a//«j f? Liitkeni). 



•2 4 ( !j ig, 20, 30, 33 Macropneustes spatangoides. 12 Echinocardium capense. 16 £<r^. mediterraneum. iS Ech. pennatifidum. 



21 £<r^. cordaium. 26 .£<:/;. flavescens. 



Fig. i. Spatangus purpureus, valve of large tridentate pedieellaria, side view. (Comp. Fig. 9). ?%• 



— 2. — — triphyllous pedieellaria. ^/^ 



— 3. Macropneustes spatangoides («Challenger», St. 33), valve of short tridentate pedieellaria. 5%. 



— 4. — — — — — - ophicephalous — ?%. 



— 5. Spatangus purpureas, ophicephalous pedieellaria. 7°^. 



— 6. — — valve of ophicephalous pedieellaria. l 7Sj x . 

 ■ — 7. — — — - short tridentate — 7%. 



— 8. — — short tridentate pedieellaria. 37/ r . 



— 9. — — valve of large tridentate pedieellaria, from the inside. (Comp. Fig. 1). 7%- 



— 10. Spatangus purpureas, — - short — side view. r +%- 



— 11. — alt us (Liitkeni!), valve of short tridentate pedieellaria. ?%. 



— 12. Echinocardium capense, — - triphyllous — 24 %. 



— 13. Macropneustes spatangoides (« Challengers, St. 33), valve of short tridentate pedieellaria. 37/ z . 



— 14. — — (<,Albatross», St. 2655), — - — — 5°/ p 



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



— 16. Echinocardium mediterraneum, valve of triphyllous pedieellaria. 2 4 /,. 



— 17. Spatangus Raschi, valve of short tridentate pedieellaria. ?%. 



— 18. Ecliinocardium pennatifidum, valve of triphyllous pedieellaria. 2 4°/ 1 . 



— 19. Spatangus altus (Lutkenil), valve of short tridentate pedieellaria. ?%. 



— 20. Macropneustes spatangoides (« Challengers, St. 33), valve of large tridentate pedieellaria. 37/ x . 



— 21. Echinocardium cordatum, valve of triphyllous pedieellaria. 2 4 / t . 



— 22. Spatangus purpureus, — - — — I2 S/ r . 



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



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



— 25. — — valve of tridentate pedieellaria. 7<y i# 



— 26. Ecliinocardium flavescens, valve of triphyllous pedieellaria. 2 4°/ I . 



— 27. Spatangus purpureus, valve of small tridentate pedieellaria. I *°/ I . 



— 28. — Raschi, — - large tridentate — 7%- 



— 29. — purpureus, specimen 4 m,D long, aetinal side. r 5/ T . 



— 30. Macropneustes spatangoides (« Challenger*, St. 33), tridentate pedieellaria. 35/j. 



— 31. Spatangus purpureus, specimen \ mm long, side view. '5/j. 



— 32. — — subanal area of a specimen 9 mm in diameter. 8 /i- 



— 33. Macropneustes spatangoides (« Challengers, St. 33), large tridentate pedieellaria. 3%. 



— 34. Spatangus purpureus, specimen 4 mm long, abactinal side. '5^. 



