Fig. I 



Plate Xn. 



Valve of tridentate pedicellaria of Phorvtosoma bztrsari'um. Obj. II. Oc. I. 



— 2. — - — — - — placenta, from the Davis Strait. Obj. II. Oc. o. 



— 3. — - — — - — — — the Gulf of Mexico. Obj. II. Oc. o. 



— 4. Developmental stage of a large tridentate pedicellaria of Pliormosoma placenta. Obj. II. Oc. o. 



— 5. Valve of a half developed — — — - — — Obj. II. Oc. o. 



— 6. — — tridentate pedicellaria of Phormosoma rigiduin. Obj. II. Oc. I. 



— 7. — — — — - — placenta (Ingolf. St. 40). Obj. II. Oc. o. 



— 8 — 10. Trausverse sections of the head of a globiferoiis pedicellaria of Hapalosoma pelluctdutn 



8. nearest to the basis, 10. in the middle, 9. at the jDoint. Obj. II. Oc. III. 



— II. Actinal primary spine of Phormosoma placenta, the bag of skin removed. Obj. 00. O c. o. 



— 12. Valve of a triph}llous pedicellaria of Kamptosoma asterias. Obj. II. Oc. III. 



— 13. — — — — - Astheiios. gracile'> (Chall. St. 219). Obj II. Oc. III. 



— 14. — — — — - Hapalosoma pelbicidiim. Obj. II. Oc. III. 



— 15. Developmental stage of a triphyllons pedicellaria of Phormosoma placenta. Obj. II. Oc. I. 



— 16. Valve of a triphyllous pedicellaria of Aperosoma Grimaldn. Obj. II. Oc. I. 



— 17. — — — — - Echinosoma tiranus. Obj. II. Oc. I. 



— 18. — — — — - Asthenosoma varium. Obj. II. Oc. III. 



— 19. Spine from the joeristome of Phormosoma place7ita\ with bag of skin. Obj. o. O c. o. 



— 20. Valve of a triphyllons pedicellaria of Hygrosoma luculenttim.. Obj. II. Oc. I. 



— 21. — — — — - Phormosojna placenta. Obj II. Oc. I. 



— 22. — — tridentate — small form, of Troniikosoma Koehleri. Obj. II. Oc. o. 



— 23. Sphæridia of Phormosoma placenta. Obj. II. Oc. I. 



— 24. Developmental stage of a triphyllous pedicellaria of Phormosoma placenta. Obj. II. Oc. I. 



— 25. Sphæridia of Phormosoma placenta. Obj. II. Oc. I. 



— 26. Valve of a small tridentate pedicellaria of Phormosoma placenta. Obj. II. Oc. o. 



— 27. — — triphyllons pedicellaria of Aræosoma coriacenm. Obj. II. Oc. I. 



— 28. — — — — - Phormosoma biirsarinm. Obj. II. Oc. I. 



— 29. — — — — - Aræosoma Belli. Obj. II. Oc. I. 



— 30. Developmental stage of a triphyllous pedicellaria of Phormosoma place^ita. Obj. II. Oc. I. 



— 31. Valve of a triphyllous pedicellaria of Tromikosoma Koehleri. Obj. II. Oc. I. 



— 32. — — — — - Kamptosoma asterias (-Phormosoma tenue i, Qhci\\.S\..2']2). 



Obj. II. Oc. III. 



— 33. Valve of a triphyllous — - Aræosoma /enestratjim. Obj. II. Oc. I. 



— 34. — — — — - Calveria hystrix. Obj. II. Oc. III. 



— 35. — — large tridentate pedicellaria of Echinosoma temie, seen half from the side. Obj. o. Oc. o. 



— 36. — — tridentate — - — ura7iHS. Obj. II. Oc. I. 



— 37 and 39. Valve of a small tridentate pedicellaria of Phormosoma placenta. Obj. II. Oc. o. The 



edge finely serrate, which cannot be seen under the magnifying powers nsed in the drawing. 



— 38. Valve of a half developed triphyllous pedicellaria of Phormosoma placenta. Obj. II. Oc. I. 



— 40. — — small tridentate pedicellaria of Echinosoma tenue. Obj. II. Oc. o. 



— 41. — — large — — - Tromikosoma Koehleri. Obj. o. Oc. o. 



— 42. — — triphyllous pedicellaria of Hygrosoma Petersii. Obj. II. Oc. I. 



