Plate XI. 



4, 7— iOi 3° Pouilalcsia Jeffreysi. i, 13, 14, 18—20, 23, 34— 37> 4°. 4' P- Wandcli. 2, 3, 5, 6, 17, 21, 24, 25, 27—29, 32, 42—44 

 Echinosigra (Pourlalcsia) paradoxa. 12, 33 P. lagiaicula. 11 P. Tanneri. 31 /^. hispida. 15, 26 Z-". rojt-a. ]6, 22, 38, 39 



Helgocystis (Pouriaksia) carinaia. 



Fig. I. Pourtalesia Wandcli, rostrate pedicellaria. 7°/^. 



— 2. Ec/iiuosigra (Pourtalesia) paradoxa, valve of tridentate pedicellaria, from the inside. '25/^_ 



— 3. — — — — - ophicephalous — "i^. 



— 4. Pourtalesia Jeffreysi, valve of ophicephalous pedicellaria, side view. '^s/j. 



— 5. Ecliinosigra (Pourtalesia) paradoxa, valve of tridentate pedicellaria. "5/i- 



— 6. — — — — - ophicephalous — side view. '^sy',. 



— 7. Pourtalesia Jeffreysi, valve of ophicephalous pedicellaria, from the inside, '^s/j. 



— 8. — — — - tridentate — i75/j. 



— 9. — — rostrate pedicellaria. 5°/,. 



— 10. — — valve of rostrate pedicellaria, from the inside. (Comp. Fig. 30). 7°/i. 

 — -II. — Tanneri, — - — — 7°j^. 



— 12. — laguncula, — - ophicephalous pedicellaria. '^s/j. 



— 13. — Wandeli, ophicephalous pedicellaria. i°j^. 



— 14. — — valve of ophicephalous pedicellaria, side view. '^s/j. 



— 15. — rosea. — - tridentate — '^5/^. 



— 16. Helgocystis (Pourtalesia) carinata, valve of globiferous pedicellaria, side view. (Comp. Fig. 22). 7°/i. 



— 17. Ecliinosigra (Pourtalesia) paradoxa, rostrate pedicellaria. 7°/i. 



— 18. Pourtalesia Wandcli, valve of ophicephalous pedicellaria. '^5/j. 



— 19- — — — - rostrate — from the inside. (Comp. Fig. 23.) 7°/,. 



— 20. — — primary spine, from the inner part of the buccal cavity. (Comp. Fig. 34). 30/j. 



— 21. Ecliinosigra (Pourtalesia) paradoxa, primary spine, from the inner part of the buccal cavity. so/j. 



— 22. Helgocystis (Pourtalesia) carinata, valve of globiferous pedicellaria, from the inside. (Comp. 



Fig. 16). 70/,. 



— 23. Pourtalesia Wandcli, valve of rostrate pedicellariæ, side view. (Comp. Fig. 19.) 70/j. 



— 24. Echinosigra (Pourtalesia) paradoxa, tridentate pedicellaria. 70/j. 



— 25. — — — sphæridia. '^s/i- 



— 26. Pourtalesia rosea, ophicephalous pedicellaria. 7°^',. 



— 27. Echinosigra (Pourtalesia) paradoxa, valve of rostrate pedicellaria, from the inside, '^s/^, 



— 28. — — — __._ — side view. "S/j. 



— 29. — — — tridentate pedicellaria. 7°/^. 



— 30. Pojtrtalesia Jeffreysi, valve of rostrate pedicellaria, side view. (Comp. Fig. 10). 7°/^. 



— 31- — hispida, — - tridentate — ^^ij-,. 



— 32. Echinosigra (Pourtalesia) paradoxa, ophicephalous pedicellaria. 70/1. 

 ~ 33- Pourtalesia laguncula, valve of tridentate pedicellaria. 7°/,. 



— 34- — Wandeli, primary spine, from the invagination, nearer the edge. (Comp. Fig. 20). 



3°/i. 



— 35. Pourtalesia Wandeli, — — from the actinal plastron. "Vi- 



— 3^- — — the point of a primary abactinal spine. 30/j. 



— 2)1- — — miliary spine, front view. (Comp. Fig. 41). i^s/j. 



— 38. Helgocystis (Pourtalesia) carinata, miliary spine. 4°/,. 



39- — — — valve of rostrate pedicellaria. 70/,. 



— 40. Pourtalesia Wandeli, tridentate pedicellaria. '^s/^. 



— 41- — — miliary spine, side view. (Comp. Fig. 37). '^s/j. 



— 42. Echinosigra (Pourtalesia) paradoxa, clavula. 70/j. 



— 43- — — — miliary spine. '^s/j. 



44- — — — primary abactinal spine. 35/j. 



